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 abac_list_t *abac_credential_clauses(abac_credential_t *); |
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25 | extern char *abac_id_clause(abac_id_cert_t *); |
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26 | |
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27 | static int debug=0; |
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28 | |
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29 | // pl -- place holder for now |
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30 | struct _abac_pl_t { |
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31 | FILE *fptr; |
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32 | char *fname; |
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33 | char *yap_certs; |
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34 | }; |
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35 | |
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36 | static int _insert_clause(char *str) |
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37 | { |
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38 | YAP_Term *eterm; |
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39 | YAP_Term goalArgs=YAP_ReadBuffer(str, eterm); |
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40 | char *tmp=YAP_CompileClause(goalArgs); |
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41 | if (tmp!=NULL) { /* something is wrong */ |
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42 | printf("error: result of compile clause (%s)\n", tmp); |
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43 | printf("error: str used (%s)\n", str); |
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44 | return 1; |
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45 | } |
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46 | return 0; |
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47 | } |
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48 | |
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49 | static int _insert_cred_clause(char *cstr) |
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50 | { |
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51 | int ret=ABAC_CERT_SUCCESS; |
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52 | int rc=_insert_clause(cstr); |
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53 | if (rc) |
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54 | return ABAC_CERT_BAD_YAP; |
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55 | return ABAC_CERT_SUCCESS; |
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56 | } |
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57 | |
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58 | static void _show_yap_db(char *msg) |
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59 | { |
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60 | char lstr[]="listing"; |
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61 | YAP_Term *eterm; /* error term */ |
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62 | |
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63 | printf("\n\n========= yap db (%s)\n",msg); |
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64 | YAP_Term goal=YAP_ReadBuffer(lstr, eterm); |
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65 | int rc =YAP_RunGoal( goal ); |
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66 | if (rc) { |
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67 | printf("listing ok.. \n"); |
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68 | } else { |
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69 | printf("listing's rc is bad.. \n"); |
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70 | YAP_Exit(1); |
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71 | } |
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72 | printf("========= \n\n"); |
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73 | } |
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74 | |
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75 | static void _set_dbg(abac_pl_t *pl) |
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76 | { |
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77 | char *fname=strdup( "/tmp/abac_yap-XXXXXX.pl" ); |
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78 | int fd = mkstemps( pl->fname, 3 ); |
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79 | if ( fd == -1) { |
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80 | printf("Couldn't get a valid temp name %s\n", fname); |
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81 | free((void*)fname); |
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82 | YAP_Exit(1); |
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83 | } |
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84 | FILE *fptr = fdopen(fd, "w"); |
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85 | if (fptr == NULL) { |
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86 | printf("Couldn't open %s for writing\n", fname); |
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87 | free((void*)fname); |
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88 | YAP_Exit(1); |
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89 | } |
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90 | pl->fptr=fptr; |
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91 | pl->fname=fname; |
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92 | } |
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93 | |
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94 | /** |
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95 | * Include some utility routines |
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96 | */ |
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97 | abac_pl_t *abac_pl_utility(void) { |
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98 | /* |
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99 | append([],L,L). |
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100 | append([X|L1],L2,[X|L3]):-append(L1,L2,L3). |
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101 | |
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102 | appendL([],[]). |
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103 | appendL([H|T], L) :- |
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104 | appendL(T,L2), append(H,L2,L). |
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105 | */ |
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106 | if(_insert_clause("append([],L,L)")) |
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107 | YAP_Exit(1); |
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108 | if(_insert_clause("append([X|L1],L2,[X|L3]):-append(L1,L2,L3)")) |
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109 | YAP_Exit(1); |
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110 | if(_insert_clause("appendL([],[])")) |
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111 | YAP_Exit(1); |
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112 | if(_insert_clause("appendL([H|T], L) :- appendL(T,L2), append(H,L2,L)")) |
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113 | YAP_Exit(1); |
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114 | } |
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115 | |
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116 | /** |
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117 | * Create a new yap structure. |
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118 | */ |
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119 | abac_pl_t *abac_pl_new(void) { |
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120 | |
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121 | if (YAP_FastInit(NULL) == YAP_BOOT_ERROR) |
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122 | YAP_Exit(1); |
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123 | |
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124 | if (YAP_RunGoal(YAP_MkAtomTerm(YAP_LookupAtom("source")))) { |
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125 | if(debug) printf("calling source..\n"); |
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126 | } else { |
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127 | if(debug) printf("calling source failed..\n"); |
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128 | YAP_Exit(1); |
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129 | } |
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130 | |
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131 | abac_pl_utility(); |
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132 | |
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133 | abac_pl_t *pl = abac_xmalloc(sizeof(abac_pl_t)); |
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134 | pl->fptr=NULL; |
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135 | pl->fname=NULL; |
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136 | pl->yap_certs=NULL; |
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137 | return pl; |
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138 | } |
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139 | |
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140 | /** |
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141 | * Add a credential to the db |
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142 | */ |
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143 | int abac_pl_add_credential(abac_pl_t *pl, abac_credential_t *cred) |
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144 | { |
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145 | int rc=0; |
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146 | abac_list_t *clauses=abac_credential_clauses(cred); |
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147 | if (clauses != NULL) { |
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148 | char *cur; |
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149 | abac_list_foreach(clauses, cur, |
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150 | if(cur) { |
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151 | if(debug) printf("inserting =>%s\n",cur); |
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152 | rc=_insert_cred_clause(cur); |
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153 | } |
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154 | ); |
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155 | } |
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156 | return rc; |
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157 | } |
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158 | |
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159 | int abac_pl_add_type_credential(abac_pl_t *pl, abac_id_cert_t *id_cert) |
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160 | { |
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161 | char *clause=abac_id_clause(id_cert); |
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162 | if (clause != NULL) { |
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163 | int rc=_insert_cred_clause(clause); |
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164 | return rc; |
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165 | } |
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166 | return 0; |
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167 | } |
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168 | |
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169 | /* cases, |
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170 | ['str'] |
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171 | ['str1','str2'] |
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172 | ([] is not possible, and don't care) |
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173 | */ |
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174 | static void _credentials_from_string(abac_stack_t *credentials,char *slist) { |
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175 | char *cptr=slist; /* current ptr */ |
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176 | char *sptr; /* string ptr */ |
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177 | char *ptr; |
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178 | int len=0; |
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179 | char *string; |
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180 | abac_credential_t *cred=NULL; |
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181 | int cnt=0; |
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182 | |
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183 | if(debug) |
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184 | printf("DEBUG:responds from yap(%s)\n",slist); |
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185 | |
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186 | /* find first [' */ |
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187 | ptr=strstr(cptr,"['"); |
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188 | if(ptr == NULL) |
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189 | return; |
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190 | cptr=ptr+2; |
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191 | sptr=cptr; |
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192 | while (1) { |
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193 | /* find next ',' or '] */ |
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194 | ptr=strstr(cptr,"','"); |
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195 | if(ptr!=NULL) { |
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196 | cptr=ptr+3; |
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197 | len=(ptr-sptr); |
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198 | string=strndup(sptr,len); |
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199 | cred=abac_credential_lookup(string); |
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200 | free(string); |
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201 | if(cred) { |
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202 | abac_stack_unique_push(credentials, cred); |
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203 | cnt++; |
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204 | } else { |
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205 | printf("BAD BAD BAD\n"); |
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206 | } |
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207 | sptr=cptr; |
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208 | } else { |
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209 | ptr=strstr(cptr,"']"); |
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210 | if(ptr!=NULL) { |
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211 | len=(ptr-sptr); |
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212 | string=strndup(sptr,len); |
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213 | cred=abac_credential_lookup(string); |
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214 | free(string); |
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215 | if(cred) { |
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216 | abac_stack_unique_push(credentials, cred); |
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217 | cnt++; |
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218 | } else { |
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219 | printf("BAD BAD BAD\n"); |
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220 | } |
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221 | break; |
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222 | } |
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223 | } |
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224 | } |
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225 | if(debug) |
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226 | printf("DEBUG:total %d credentials\n", cnt); |
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227 | } |
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228 | |
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229 | |
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230 | static abac_stack_t *_make_yap_query(char *cn_prin, char *cn_rule, char* estring) |
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231 | { |
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232 | YAP_Term *eterm; |
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233 | YAP_Term arg[3]; |
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234 | char tmp[5000]; |
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235 | abac_stack_t *cred_list = abac_stack_new(); |
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236 | |
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237 | if(debug) printf(" the role part(%s)\n", estring); |
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238 | arg[0]=YAP_MkAtomTerm(YAP_LookupAtom(cn_prin)); |
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239 | if(debug) printf(" the principal part(%s)\n", cn_prin); |
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240 | arg[1]=YAP_ReadBuffer(estring,eterm); |
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241 | arg[2]=YAP_MkVarTerm(); |
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242 | YAP_Atom f = YAP_LookupAtom("isMember"); |
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243 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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244 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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245 | |
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246 | int rc =YAP_RunGoal( goal ); |
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247 | if (rc) { |
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248 | printf("YAP query succeed\n"); |
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249 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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250 | if(debug) printf(" query answer : %s\n", tmp); |
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251 | /* this is returned as ['string1','string2'] */ |
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252 | _credentials_from_string(cred_list,tmp); |
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253 | /**** XXX somehow this got stuck in yap ??? |
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254 | while (YAP_RestartGoal()) { |
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255 | if(debug) printf("another success\n"); |
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256 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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257 | if(debug) printf(" query answer : %s\n", tmp); |
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258 | _credentials_from_string(cred_list,tmp); |
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259 | } |
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260 | ***/ |
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261 | } else { |
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262 | printf("YAP query failed\n"); |
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263 | /* YAP_Exit(1); */ |
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264 | } |
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265 | return cred_list; |
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266 | } |
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267 | |
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268 | /* 2 types |
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269 | acme.buys_rocket <- coyote (coyote=prin, acme.buys_rocket=role) |
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270 | ==> isMember(coyote,role(acme,buys_rocket), L) |
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271 | |
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272 | acme.buys_rocket <- acme.preferred_customer -- NOT DONE YET */ |
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273 | static abac_stack_t *_query_with_role(abac_pl_t *pl, abac_role_t* role, abac_role_t* role_prin) |
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274 | { |
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275 | char tmp[5000]; |
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276 | abac_stack_t *ret=NULL; |
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277 | |
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278 | if(1) |
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279 | _show_yap_db("DEBUG:calling within _query_with_role"); |
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280 | |
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281 | char *cn_prin=abac_cn_with_role(role_prin); |
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282 | char *cn_role=abac_cn_with_role(role); |
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283 | |
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284 | if(abac_role_role_name(role_prin)!=NULL) { |
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285 | printf("fail, a.r <- b.r query is not implemented yet !!!\n"); |
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286 | YAP_Exit(1); |
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287 | } |
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288 | |
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289 | if (cn_prin == NULL || cn_role == NULL) { |
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290 | printf("fail, query's call got bad roles.. \n"); |
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291 | YAP_Exit(1); |
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292 | } |
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293 | |
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294 | if(debug) printf("printing up the yap query ..\n"); |
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295 | char *pstring=abac_role_role_param_string(role); |
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296 | if(pstring) { |
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297 | sprintf(tmp,"role(%s,%s,%s)", cn_role, abac_role_role_name(role),pstring); |
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298 | free(pstring); |
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299 | } else { |
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300 | sprintf(tmp,"role(%s,%s)", cn_role, abac_role_role_name(role)); |
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301 | } |
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302 | ret=_make_yap_query(cn_prin,cn_role,tmp); |
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303 | return ret; |
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304 | } |
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305 | |
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306 | static abac_stack_t *_query_with_oset(abac_pl_t *pl, abac_oset_t* oset, abac_oset_t* oset_obj) |
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307 | { |
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308 | char tmp[5000]; |
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309 | abac_stack_t *ret=NULL; |
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310 | |
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311 | if(debug) |
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312 | _show_yap_db("DEBUG:calling within _query_with_oset"); |
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313 | |
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314 | char *cn_oset=abac_cn_with_oset(oset); |
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315 | /* could be obj or principal */ |
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316 | char *cn_prin=NULL; |
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317 | if(abac_oset_is_object(oset_obj)) { |
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318 | cn_prin=abac_oset_object_cn(oset_obj); |
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319 | } else { |
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320 | cn_prin=abac_oset_principal_cn(oset_obj); |
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321 | } |
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322 | |
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323 | if(abac_oset_oset_name(oset_obj)!=NULL) { |
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324 | printf("fail, a.o <- b.o query is not implemented yet !!!\n"); |
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325 | YAP_Exit(1); |
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326 | } |
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327 | |
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328 | if (cn_prin == NULL || cn_oset == NULL) { |
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329 | printf("fail, query's call got bad oset.. \n"); |
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330 | YAP_Exit(1); |
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331 | } |
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332 | |
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333 | if(debug) printf("printing up the yap query ..\n"); |
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334 | char *pstring=abac_oset_oset_param_string(oset); |
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335 | if(pstring) { |
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336 | sprintf(tmp,"oset(%s,%s,%s)", cn_oset, abac_oset_oset_name(oset),pstring); |
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337 | free(pstring); |
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338 | } else { |
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339 | sprintf(tmp,"oset(%s,%s)", cn_oset, abac_oset_oset_name(oset)); |
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340 | } |
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341 | |
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342 | ret=_make_yap_query(cn_prin,cn_oset,tmp); |
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343 | return ret; |
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344 | } |
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345 | |
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346 | static abac_stack_t *_dump(abac_pl_t *pl) |
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347 | { |
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348 | YAP_Term *eterm; |
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349 | YAP_Term arg[3]; |
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350 | char tmp[5000]; |
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351 | abac_stack_t *cred_list = abac_stack_new(); |
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352 | |
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353 | if(debug) |
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354 | _show_yap_db("DEBUG:calling within _dump"); |
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355 | |
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356 | arg[0]=YAP_MkVarTerm(); |
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357 | arg[1]=YAP_MkVarTerm(); |
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358 | arg[2]=YAP_MkVarTerm(); |
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359 | YAP_Atom f = YAP_LookupAtom("isMember"); |
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360 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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361 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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362 | |
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363 | int rc =YAP_RunGoal( goal ); |
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364 | if (rc) { |
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365 | printf("YAP dump succeed\n"); |
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366 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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367 | if(debug) printf(" dump answer : %s\n", tmp); |
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368 | /* this is returned as ['string1','string2'] */ |
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369 | _credentials_from_string(cred_list,tmp); |
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370 | while (YAP_RestartGoal()) { |
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371 | if(debug) printf("another dump success\n"); |
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372 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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373 | if(debug) printf(" dump restart answer : %s\n", tmp); |
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374 | _credentials_from_string(cred_list,tmp); |
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375 | } |
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376 | } else { |
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377 | printf("YAP _dump query failed\n"); |
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378 | /* YAP_Exit(1); */ |
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379 | } |
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380 | return cred_list; |
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381 | } |
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382 | |
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383 | /** |
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384 | * Get all the credentials (attribute/issuer cert pairs) from prolog |
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385 | * (which returns in string form) |
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386 | */ |
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387 | abac_stack_t *abac_pl_credentials(abac_pl_t *pl) |
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388 | { |
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389 | abac_stack_t *ret=_dump(pl); |
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390 | return ret; |
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391 | } |
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392 | |
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393 | /** |
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394 | * Make a query into prolog db |
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395 | --role acme.preferred_customer --principal coyote |
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396 | --role acme.prefer_customer.buy_rockets --principlal coyote |
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397 | --oset acme.rockets -- object mrx-21 |
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398 | --oset acme.villans -- principal coyote |
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399 | */ |
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400 | abac_stack_t *abac_pl_query(abac_pl_t *pl, char *roleoset, char *prinobj) |
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401 | { |
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402 | abac_stack_t *ret=NULL; |
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403 | int len=strlen(roleoset)+strlen(prinobj)+5; |
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404 | char* attr_string=(char *) abac_xmalloc(sizeof(char)*len); |
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405 | sprintf(attr_string,"%s<-%s", roleoset, prinobj); |
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406 | |
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407 | if(debug) |
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408 | printf("abac_pl_query, query string is (%s)\n",attr_string); |
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409 | |
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410 | /* call into yacc parser */ |
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411 | abac_reset_yyfptr(attr_string); |
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412 | abac_yy_init(); |
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413 | int rc=yyparse(); |
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414 | if (rc) { |
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415 | free(attr_string); |
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416 | return NULL; |
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417 | } |
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418 | |
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419 | if(abac_yy_get_rule_is_oset()) { |
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420 | abac_oset_t *head_oset = abac_yy_get_rule_head_oset(); |
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421 | abac_oset_t *tail_oset = abac_yy_get_rule_tail_oset(); |
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422 | ret=_query_with_oset(pl,head_oset,tail_oset); |
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423 | } else { |
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424 | abac_role_t *head_role = abac_yy_get_rule_head_role(); |
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425 | abac_role_t *tail_role = abac_yy_get_rule_tail_role(); |
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426 | ret=_query_with_role(pl,head_role,tail_role); |
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427 | } |
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428 | return ret; |
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429 | } |
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430 | |
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431 | void abac_pl_free(abac_pl_t *pl) { |
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432 | if(pl->fptr) { |
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433 | fflush(pl->fptr); |
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434 | free(pl->fptr); |
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435 | } |
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436 | if(pl->fname) { |
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437 | unlink(pl->fname); |
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438 | free(pl->fname); |
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439 | } |
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440 | free(pl); |
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441 | } |
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442 | |
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