1 | |
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2 | /* copied from abac_graph.c |
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3 | implementation of the low level using |
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4 | yap prolog |
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5 | */ |
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6 | |
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7 | #include <err.h> |
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8 | #include <stdio.h> |
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9 | #include <assert.h> |
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10 | #include <stdlib.h> |
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11 | #include <string.h> |
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12 | #include <Yap/YapInterface.h> |
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13 | |
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14 | #include "abac_pl.h" |
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15 | #include "abac_pl_yap.h" |
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16 | |
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17 | #include "abac_list.h" |
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18 | #include "abac_util.h" |
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19 | |
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20 | #include "uthash.h" |
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21 | |
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22 | extern char *abac_cn_with_role(abac_role_t *); |
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23 | extern char *abac_cn_with_oset(abac_oset_t *); |
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24 | extern char *abac_principalname_with_role(abac_role_t *); |
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25 | extern char *abac_principalname_with_oset(abac_oset_t *); |
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26 | extern abac_list_t *abac_credential_clauses(abac_credential_t *); |
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27 | extern char *abac_id_clause(abac_id_cert_t *); |
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28 | extern abac_oset_t *abac_yy_get_rule_tail_oset(); |
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29 | extern abac_oset_t *abac_yy_get_rule_head_oset(); |
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30 | extern abac_role_t *abac_yy_get_rule_tail_role(); |
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31 | extern abac_role_t *abac_yy_get_rule_head_role(); |
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32 | |
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33 | |
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34 | static int debug=0; |
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35 | /* track constraint's external clause's -unique name id */ |
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36 | static int constraint_label_count=0; |
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37 | static char *constraint_label="isABAC_constraint"; |
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38 | |
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39 | // pl -- place holder for now |
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40 | struct _abac_pl_t { |
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41 | FILE *fptr; |
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42 | char *fname; |
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43 | char *yap_certs; |
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44 | }; |
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45 | |
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46 | /***********************************************************/ |
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47 | static int _get_next_constraint_label_idx() |
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48 | { |
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49 | constraint_label_count++; |
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50 | return constraint_label_count; |
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51 | } |
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52 | |
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53 | static int _get_constraint_label_idx() |
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54 | { |
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55 | return constraint_label_count; |
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56 | } |
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57 | |
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58 | /***********************************************************/ |
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59 | |
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60 | static int _insert_clause(char *str) |
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61 | { |
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62 | YAP_Term *eterm; |
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63 | YAP_Term goalArgs=YAP_ReadBuffer(str, eterm); |
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64 | char *tmp=YAP_CompileClause(goalArgs); |
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65 | if (tmp!=NULL) { /* something is wrong */ |
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66 | printf("error: result of compile clause (%s)\n", tmp); |
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67 | printf("error: str used (%s)\n", str); |
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68 | return 1; |
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69 | } |
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70 | return 0; |
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71 | } |
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72 | |
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73 | static int _insert_cred_clause(char *cstr) |
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74 | { |
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75 | int ret=ABAC_CERT_SUCCESS; |
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76 | int rc=_insert_clause(cstr); |
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77 | if (rc) |
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78 | return ABAC_CERT_BAD_YAP; |
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79 | return ABAC_CERT_SUCCESS; |
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80 | } |
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81 | |
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82 | static void _show_yap_db(char *msg) |
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83 | { |
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84 | char lstr[]="listing"; |
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85 | YAP_Term *eterm; /* error term */ |
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86 | |
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87 | printf("\n\n========= yap db (%s)\n",msg); |
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88 | YAP_Term goal=YAP_ReadBuffer(lstr, eterm); |
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89 | int rc =YAP_RunGoal( goal ); |
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90 | if (rc) { |
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91 | printf("listing ok.. \n"); |
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92 | } else { |
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93 | printf("listing's rc is bad.. \n"); |
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94 | YAP_Exit(1); |
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95 | } |
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96 | printf("========= \n\n"); |
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97 | } |
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98 | |
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99 | static void _set_dbg(abac_pl_t *pl) |
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100 | { |
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101 | char *fname=strdup( "/tmp/abac_yap-XXXXXX.pl" ); |
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102 | int fd = mkstemps( pl->fname, 3 ); |
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103 | if ( fd == -1) { |
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104 | printf("Couldn't get a valid temp name %s\n", fname); |
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105 | free((void*)fname); |
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106 | YAP_Exit(1); |
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107 | } |
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108 | FILE *fptr = fdopen(fd, "w"); |
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109 | if (fptr == NULL) { |
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110 | printf("Couldn't open %s for writing\n", fname); |
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111 | free((void*)fname); |
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112 | YAP_Exit(1); |
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113 | } |
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114 | pl->fptr=fptr; |
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115 | pl->fname=fname; |
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116 | } |
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117 | |
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118 | /** |
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119 | * Include some utility routines |
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120 | */ |
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121 | abac_pl_t *abac_pl_utility(void) { |
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122 | /* |
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123 | append([],L,L). |
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124 | append([X|L1],L2,[X|L3]):-append(L1,L2,L3). |
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125 | |
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126 | appendL([],[]). |
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127 | appendL([H|T], L) :- |
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128 | appendL(T,L2), append(H,L2,L). |
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129 | */ |
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130 | if(_insert_clause("append([],L,L)")) |
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131 | YAP_Exit(1); |
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132 | if(_insert_clause("append([X|L1],L2,[X|L3]):-append(L1,L2,L3)")) |
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133 | YAP_Exit(1); |
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134 | if(_insert_clause("appendL([],[])")) |
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135 | YAP_Exit(1); |
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136 | if(_insert_clause("appendL([H|T], L) :- appendL(T,L2), append(H,L2,L)")) |
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137 | YAP_Exit(1); |
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138 | } |
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139 | |
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140 | /** |
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141 | * Create a new yap structure. |
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142 | */ |
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143 | abac_pl_t *abac_pl_new(void) { |
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144 | |
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145 | if (YAP_FastInit(NULL) == YAP_BOOT_ERROR) |
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146 | YAP_Exit(1); |
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147 | |
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148 | if (YAP_RunGoal(YAP_MkAtomTerm(YAP_LookupAtom("source")))) { |
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149 | if(debug) printf("calling source..\n"); |
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150 | } else { |
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151 | if(debug) printf("calling source failed..\n"); |
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152 | YAP_Exit(1); |
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153 | } |
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154 | |
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155 | abac_pl_utility(); |
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156 | |
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157 | abac_pl_t *pl = abac_xmalloc(sizeof(abac_pl_t)); |
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158 | pl->fptr=NULL; |
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159 | pl->fname=NULL; |
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160 | pl->yap_certs=NULL; |
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161 | return pl; |
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162 | } |
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163 | |
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164 | /** |
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165 | * Add a credential to the db |
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166 | */ |
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167 | int abac_pl_add_credential(abac_pl_t *pl, abac_credential_t *cred) |
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168 | { |
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169 | int rc=0; |
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170 | abac_list_t *clauses=abac_credential_clauses(cred); |
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171 | if (clauses != NULL) { |
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172 | char *cur; |
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173 | abac_list_foreach(clauses, cur, |
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174 | if(cur) { |
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175 | if(debug) printf("inserting =>%s\n",cur); |
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176 | rc=_insert_cred_clause(cur); |
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177 | } |
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178 | ); |
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179 | } |
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180 | return rc; |
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181 | } |
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182 | |
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183 | int abac_pl_add_type_credential(abac_pl_t *pl, abac_id_cert_t *id_cert) |
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184 | { |
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185 | char *clause=abac_id_clause(id_cert); |
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186 | if (clause != NULL) { |
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187 | int rc=_insert_cred_clause(clause); |
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188 | return rc; |
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189 | } |
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190 | return 0; |
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191 | } |
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192 | |
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193 | /* string1(S):- S="abc";S="efg";S="ijk" */ |
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194 | char *abac_pl_add_range_constraint_clause(char *var, char *tmplist) |
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195 | { |
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196 | int i=_get_next_constraint_label_idx(); |
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197 | char *tmp=NULL; |
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198 | asprintf(&tmp,"%s_%d(%s) :- %s", constraint_label, i, var, tmplist); |
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199 | int rc=_insert_cred_clause(tmp); |
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200 | free(tmp); |
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201 | if(rc) |
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202 | panic("abac_pl_add_range_constraint_clause, failed to insert"); |
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203 | asprintf(&tmp,"%s_%d(%s)", constraint_label, i, var); |
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204 | return tmp; |
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205 | } |
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206 | |
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207 | /* cases, |
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208 | ['str'] |
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209 | ['str1','str2'] |
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210 | ([] is not possible, and don't care) |
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211 | */ |
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212 | static void _credentials_from_string(abac_stack_t *credentials,char *slist) { |
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213 | char *cptr=slist; /* current ptr */ |
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214 | char *sptr; /* string ptr */ |
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215 | char *ptr; |
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216 | int len=0; |
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217 | char *string; |
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218 | abac_credential_t *cred=NULL; |
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219 | int cnt=0; |
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220 | |
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221 | /* find first [' */ |
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222 | ptr=strstr(cptr,"['"); |
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223 | if(ptr == NULL) |
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224 | return; |
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225 | cptr=ptr+2; |
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226 | sptr=cptr; |
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227 | while (1) { |
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228 | /* find next ',' or '] */ |
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229 | ptr=strstr(cptr,"','"); |
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230 | if(ptr!=NULL) { |
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231 | cptr=ptr+3; |
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232 | len=(ptr-sptr); |
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233 | string=strndup(sptr,len); |
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234 | cred=abac_credential_lookup(string); |
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235 | free(string); |
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236 | if(cred) { |
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237 | int i=abac_stack_unique_push(credentials, cred); |
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238 | if(i) cnt++; |
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239 | } else { |
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240 | printf("BAD BAD BAD\n"); |
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241 | } |
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242 | sptr=cptr; |
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243 | } else { |
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244 | ptr=strstr(cptr,"']"); |
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245 | if(ptr!=NULL) { |
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246 | len=(ptr-sptr); |
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247 | string=strndup(sptr,len); |
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248 | cred=abac_credential_lookup(string); |
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249 | free(string); |
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250 | if(cred) { |
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251 | int i=abac_stack_unique_push(credentials, cred); |
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252 | if(i) cnt++; |
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253 | } else { |
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254 | printf("BAD BAD BAD\n"); |
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255 | } |
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256 | break; |
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257 | } |
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258 | } |
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259 | } |
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260 | if(debug) |
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261 | printf("DEBUG:total %d credentials\n", cnt); |
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262 | } |
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263 | |
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264 | static abac_stack_t *_make_yap_query(char *prin, char *rule, char* estring) |
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265 | { |
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266 | YAP_Term *eterm0; |
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267 | YAP_Term *eterm1; |
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268 | YAP_Term arg[3]; |
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269 | char tmp[5000]; |
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270 | abac_stack_t *cred_list = abac_stack_new(); |
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271 | |
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272 | if(debug) printf(" the principal part(%s)\n", prin); |
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273 | if(prin[0]=='\'' || prin[0]=='"') { |
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274 | arg[0]=YAP_ReadBuffer(prin,eterm0); |
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275 | } else { |
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276 | arg[0]=YAP_MkAtomTerm(YAP_LookupAtom(prin)); |
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277 | } |
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278 | if(debug) printf(" the role/oset part(%s)\n", estring); |
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279 | arg[1]=YAP_ReadBuffer(estring,eterm1); |
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280 | |
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281 | /* var for credential list */ |
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282 | arg[2]=YAP_MkVarTerm(); |
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283 | |
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284 | YAP_Atom f = YAP_LookupAtom("isMember"); |
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285 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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286 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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287 | |
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288 | int rc =YAP_RunGoal( goal ); |
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289 | if (rc) { |
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290 | printf("YAP query succeed\n"); |
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291 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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292 | /* this is returned as ['string1','string2'] */ |
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293 | if(debug) printf(" query answer : %s\n", tmp); |
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294 | _credentials_from_string(cred_list,tmp); |
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295 | /**** XXX somehow this got stuck in yap ??? */ |
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296 | while (YAP_RestartGoal()) { |
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297 | if(debug) printf("another success\n"); |
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298 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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299 | if(debug) printf(" restart query answer : %s\n", tmp); |
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300 | _credentials_from_string(cred_list,tmp); |
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301 | } |
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302 | /***/ |
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303 | } else { |
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304 | printf("YAP query failed\n"); |
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305 | /* YAP_Exit(1); */ |
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306 | } |
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307 | return cred_list; |
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308 | } |
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309 | |
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310 | /* 2 types |
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311 | acme.buys_rocket <- coyote (coyote=prin, acme.buys_rocket=role) |
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312 | ==> isMember(coyote,role(acme,buys_rocket), L) |
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313 | |
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314 | acme.buys_rocket <- acme.preferred_customer -- NOT DONE YET */ |
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315 | static abac_stack_t *_query_with_role(abac_pl_t *pl, abac_role_t* role, abac_role_t* role_prin) |
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316 | { |
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317 | char tmp[5000]; |
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318 | abac_stack_t *ret=NULL; |
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319 | |
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320 | if(debug) |
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321 | _show_yap_db("DEBUG:calling within _query_with_role"); |
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322 | |
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323 | /* if using cn */ |
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324 | char *prin_nm; |
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325 | char *role_nm; |
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326 | if(USE("ABAC_CN")) { |
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327 | prin_nm=abac_cn_with_role(role_prin); |
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328 | role_nm=abac_cn_with_role(role); |
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329 | } else { |
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330 | prin_nm=abac_principalname_with_role(role_prin); |
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331 | role_nm=abac_principalname_with_role(role); |
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332 | } |
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333 | |
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334 | if(abac_role_role_name(role_prin)!=NULL) { |
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335 | printf("fail, a.r <- b.r query is not implemented yet !!!\n"); |
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336 | YAP_Exit(1); |
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337 | } |
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338 | |
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339 | if (prin_nm == NULL || role_nm == NULL) { |
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340 | printf("fail, query's call got bad roles.. \n"); |
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341 | YAP_Exit(1); |
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342 | } |
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343 | |
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344 | if(debug) printf("printing up the yap query ..\n"); |
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345 | char *pstring=abac_role_role_param_string(role); |
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346 | if(pstring) { |
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347 | sprintf(tmp,"role(%s,%s,%s)", role_nm, abac_role_role_name(role),pstring); |
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348 | free(pstring); |
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349 | } else { |
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350 | sprintf(tmp,"role(%s,%s)", role_nm, abac_role_role_name(role)); |
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351 | } |
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352 | ret=_make_yap_query(prin_nm,role_nm,tmp); |
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353 | return ret; |
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354 | } |
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355 | |
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356 | static abac_stack_t *_query_with_oset(abac_pl_t *pl, abac_oset_t* oset, abac_oset_t* oset_obj) |
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357 | { |
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358 | char tmp[5000]; |
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359 | abac_stack_t *ret=NULL; |
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360 | |
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361 | if(debug) |
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362 | _show_yap_db("DEBUG:calling within _query_with_oset"); |
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363 | |
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364 | |
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365 | char *oset_nm=NULL; |
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366 | if(USE("ABAC_CN")) oset_nm=abac_cn_with_oset(oset); |
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367 | else oset_nm=abac_principalname_with_oset(oset); |
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368 | /* could be obj or principal */ |
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369 | char *prin_nm=NULL; |
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370 | if(abac_oset_is_object(oset_obj)) { |
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371 | prin_nm=abac_oset_object_name(oset_obj); |
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372 | } else { |
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373 | if(USE("ABAC_CN")) prin_nm=abac_oset_principal_cn(oset_obj); |
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374 | else prin_nm=abac_oset_principal_principalname(oset_obj); |
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375 | } |
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376 | |
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377 | if(abac_oset_oset_name(oset_obj)!=NULL) { |
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378 | printf("fail, a.o <- b.o query is not implemented yet !!!\n"); |
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379 | YAP_Exit(1); |
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380 | } |
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381 | |
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382 | if (prin_nm == NULL || oset_nm == NULL) { |
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383 | printf("fail, query's call got bad oset.. \n"); |
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384 | YAP_Exit(1); |
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385 | } |
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386 | |
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387 | if(debug) printf("printing up the yap query ..\n"); |
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388 | char *pstring=abac_oset_oset_param_string(oset); |
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389 | if(pstring) { |
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390 | sprintf(tmp,"oset(%s,%s,%s)", oset_nm, abac_oset_oset_name(oset),pstring); |
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391 | free(pstring); |
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392 | } else { |
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393 | sprintf(tmp,"oset(%s,%s)", oset_nm, abac_oset_oset_name(oset)); |
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394 | } |
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395 | |
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396 | ret=_make_yap_query(prin_nm,oset_nm,tmp); |
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397 | return ret; |
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398 | } |
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399 | |
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400 | static abac_stack_t *_dump(abac_pl_t *pl) |
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401 | { |
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402 | YAP_Term *eterm; |
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403 | YAP_Term arg[3]; |
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404 | char tmp[5000]; |
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405 | abac_stack_t *cred_list = abac_stack_new(); |
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406 | |
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407 | if(USE("DUMP_DB")) |
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408 | _show_yap_db("DEBUG:calling within _dump"); |
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409 | |
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410 | char *estring=NULL; |
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411 | YAP_Term *eterm1; |
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412 | YAP_Term *eterm2; |
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413 | asprintf(&estring,"_"); |
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414 | /* |
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415 | arg[0]=YAP_ReadBuffer(estring,eterm1); |
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416 | arg[1]=YAP_ReadBuffer(estring,eterm2); |
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417 | */ |
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418 | arg[0]=YAP_MkVarTerm(); |
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419 | arg[1]=YAP_MkVarTerm(); |
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420 | arg[2]=YAP_MkVarTerm(); |
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421 | YAP_Atom f = YAP_LookupAtom("isMember"); |
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422 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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423 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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424 | |
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425 | int rc =YAP_RunGoal( goal ); |
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426 | if (rc) { |
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427 | printf("YAP dump succeed\n"); |
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428 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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429 | if(debug) printf(" dump answer : %s\n", tmp); |
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430 | /* this is returned as ['string1','string2'] */ |
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431 | _credentials_from_string(cred_list,tmp); |
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432 | while (YAP_RestartGoal()) { |
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433 | if(debug) printf("another dump success\n"); |
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434 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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435 | if(debug) printf(" dump restart answer : %s\n", tmp); |
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436 | _credentials_from_string(cred_list,tmp); |
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437 | } |
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438 | } else { |
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439 | printf("YAP _dump query failed\n"); |
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440 | /* YAP_Exit(1); */ |
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441 | } |
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442 | return cred_list; |
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443 | } |
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444 | |
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445 | /* findall(X,isMember(_,_,X),L) */ |
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446 | static abac_stack_t *_dump2(abac_pl_t *pl) |
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447 | { |
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448 | YAP_Term *eterm; |
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449 | YAP_Term arg[3]; |
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450 | char tmp[5000]; |
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451 | abac_stack_t *cred_list = abac_stack_new(); |
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452 | |
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453 | if(debug) |
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454 | _show_yap_db("DEBUG:calling within _dump"); |
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455 | |
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456 | char *estring="isMember(_,_,X)"; |
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457 | arg[0]=YAP_MkAtomTerm(YAP_LookupAtom("X")); |
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458 | arg[1]=YAP_ReadBuffer(estring,eterm); |
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459 | arg[2]=YAP_MkVarTerm(); |
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460 | YAP_Atom f = YAP_LookupAtom("findall"); |
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461 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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462 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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463 | |
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464 | int rc =YAP_RunGoal( goal ); |
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465 | if (rc) { |
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466 | printf("YAP dump succeed\n"); |
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467 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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468 | if(debug) printf(" dump answer : %s\n", tmp); |
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469 | /* this is returned as ['string1','string2'] */ |
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470 | _credentials_from_string(cred_list,tmp); |
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471 | } else { |
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472 | printf("YAP _dump query failed\n"); |
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473 | /* YAP_Exit(1); */ |
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474 | } |
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475 | return cred_list; |
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476 | } |
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477 | |
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478 | /** |
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479 | * Get all the credentials (attribute/issuer cert pairs) from prolog |
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480 | * (which returns in string form) |
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481 | */ |
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482 | abac_stack_t *abac_pl_credentials(abac_pl_t *pl) |
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483 | { |
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484 | abac_stack_t *ret=_dump(pl); |
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485 | return ret; |
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486 | } |
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487 | |
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488 | /** |
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489 | * Make a query into prolog db |
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490 | --role acme.preferred_customer --principal coyote |
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491 | --role acme.prefer_customer.buy_rockets --principlal coyote |
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492 | --oset acme.rockets -- object mrx-21 |
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493 | --oset acme.villans -- principal coyote |
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494 | */ |
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495 | abac_stack_t *abac_pl_query(abac_pl_t *pl, char *roleoset, char *prinobj) |
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496 | { |
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497 | abac_stack_t *ret=NULL; |
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498 | int len=strlen(roleoset)+strlen(prinobj)+5; |
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499 | char* attr_string=(char *) abac_xmalloc(sizeof(char)*len); |
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500 | sprintf(attr_string,"%s<-%s", roleoset, prinobj); |
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501 | |
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502 | if(debug) |
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503 | printf("abac_pl_query, query string is (%s)\n",attr_string); |
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504 | |
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505 | /* call into yacc parser */ |
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506 | abac_reset_yyfptr(attr_string); |
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507 | abac_yy_init(); |
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508 | int rc=yyparse(); |
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509 | if (rc) { |
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510 | free(attr_string); |
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511 | return NULL; |
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512 | } |
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513 | |
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514 | if(abac_yy_get_rule_is_oset()) { |
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515 | abac_oset_t *head_oset = abac_yy_get_rule_head_oset(); |
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516 | abac_oset_t *tail_oset = abac_yy_get_rule_tail_oset(); |
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517 | ret=_query_with_oset(pl,head_oset,tail_oset); |
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518 | } else { |
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519 | abac_role_t *head_role = abac_yy_get_rule_head_role(); |
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520 | abac_role_t *tail_role = abac_yy_get_rule_tail_role(); |
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521 | ret=_query_with_role(pl,head_role,tail_role); |
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522 | } |
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523 | return ret; |
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524 | } |
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525 | |
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526 | void abac_pl_free(abac_pl_t *pl) { |
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527 | if(pl->fptr) { |
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528 | fflush(pl->fptr); |
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529 | free(pl->fptr); |
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530 | } |
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531 | if(pl->fname) { |
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532 | unlink(pl->fname); |
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533 | free(pl->fname); |
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534 | } |
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535 | free(pl); |
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536 | } |
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537 | |
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