[e95d652] | 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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[8bd77b5] | 14 | #include "abac_internal.h" |
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[e95d652] | 15 | |
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[8bd77b5] | 16 | #include "abac_pl_yap.h" |
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[e95d652] | 17 | #include "abac_util.h" |
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| 18 | |
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| 19 | #include "uthash.h" |
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| 20 | |
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[da5afdf] | 21 | extern abac_list_t *abac_credential_clauses(abac_credential_t *); |
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[8bd77b5] | 22 | extern char *abac_id_clause(abac_id_credential_t *); |
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| 23 | extern abac_aspect_t *abac_yy_get_rule_tail_aspect(); |
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| 24 | extern abac_aspect_t *abac_yy_get_rule_head_aspect(); |
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[0d0c3a9] | 25 | |
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[202a7f9] | 26 | static int debug=0; |
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[8bd77b5] | 27 | |
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[d5bbd3e] | 28 | /* track constraint's external clause's -unique name id */ |
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[8bd77b5] | 29 | |
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[d5bbd3e] | 30 | static int constraint_label_count=0; |
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| 31 | static char *constraint_label="isABAC_constraint"; |
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[e95d652] | 32 | |
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[da5afdf] | 33 | // pl -- place holder for now |
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[e95d652] | 34 | struct _abac_pl_t { |
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| 35 | FILE *fptr; |
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| 36 | char *fname; |
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| 37 | char *yap_certs; |
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| 38 | }; |
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| 39 | |
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[d5bbd3e] | 40 | /***********************************************************/ |
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| 41 | static int _get_next_constraint_label_idx() |
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| 42 | { |
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| 43 | constraint_label_count++; |
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| 44 | return constraint_label_count; |
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| 45 | } |
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| 46 | |
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| 47 | static int _get_constraint_label_idx() |
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| 48 | { |
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| 49 | return constraint_label_count; |
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| 50 | } |
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| 51 | |
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| 52 | /***********************************************************/ |
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| 53 | |
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[53e540d] | 54 | static int _insert_clause(char *str) |
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[e95d652] | 55 | { |
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[202a7f9] | 56 | YAP_Term *eterm; |
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[53e540d] | 57 | YAP_Term goalArgs=YAP_ReadBuffer(str, eterm); |
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| 58 | char *tmp=YAP_CompileClause(goalArgs); |
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| 59 | if (tmp!=NULL) { /* something is wrong */ |
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| 60 | printf("error: result of compile clause (%s)\n", tmp); |
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| 61 | printf("error: str used (%s)\n", str); |
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| 62 | return 1; |
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[e95d652] | 63 | } |
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[53e540d] | 64 | return 0; |
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[e95d652] | 65 | } |
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| 66 | |
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[53e540d] | 67 | static int _insert_cred_clause(char *cstr) |
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[e95d652] | 68 | { |
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| 69 | int ret=ABAC_CERT_SUCCESS; |
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[53e540d] | 70 | int rc=_insert_clause(cstr); |
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| 71 | if (rc) |
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| 72 | return ABAC_CERT_BAD_YAP; |
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| 73 | return ABAC_CERT_SUCCESS; |
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[e95d652] | 74 | } |
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| 75 | |
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[440ba20] | 76 | void show_yap_db(const char *msg) |
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[e95d652] | 77 | { |
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| 78 | char lstr[]="listing"; |
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[da5afdf] | 79 | YAP_Term *eterm; /* error term */ |
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[e95d652] | 80 | |
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[53e540d] | 81 | printf("\n\n========= yap db (%s)\n",msg); |
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[e95d652] | 82 | YAP_Term goal=YAP_ReadBuffer(lstr, eterm); |
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| 83 | int rc =YAP_RunGoal( goal ); |
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| 84 | if (rc) { |
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| 85 | printf("listing ok.. \n"); |
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| 86 | } else { |
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| 87 | printf("listing's rc is bad.. \n"); |
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| 88 | YAP_Exit(1); |
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| 89 | } |
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[53e540d] | 90 | printf("========= \n\n"); |
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[e95d652] | 91 | } |
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| 92 | |
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[53e540d] | 93 | /** |
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| 94 | * Include some utility routines |
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| 95 | */ |
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| 96 | abac_pl_t *abac_pl_utility(void) { |
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| 97 | /* |
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| 98 | append([],L,L). |
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| 99 | append([X|L1],L2,[X|L3]):-append(L1,L2,L3). |
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| 100 | |
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| 101 | appendL([],[]). |
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| 102 | appendL([H|T], L) :- |
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| 103 | appendL(T,L2), append(H,L2,L). |
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| 104 | */ |
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| 105 | if(_insert_clause("append([],L,L)")) |
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| 106 | YAP_Exit(1); |
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| 107 | if(_insert_clause("append([X|L1],L2,[X|L3]):-append(L1,L2,L3)")) |
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| 108 | YAP_Exit(1); |
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| 109 | if(_insert_clause("appendL([],[])")) |
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| 110 | YAP_Exit(1); |
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| 111 | if(_insert_clause("appendL([H|T], L) :- appendL(T,L2), append(H,L2,L)")) |
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| 112 | YAP_Exit(1); |
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[e95d652] | 113 | } |
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| 114 | |
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[53e540d] | 115 | /** |
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| 116 | * Create a new yap structure. |
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| 117 | */ |
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| 118 | abac_pl_t *abac_pl_new(void) { |
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| 119 | |
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| 120 | if (YAP_FastInit(NULL) == YAP_BOOT_ERROR) |
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| 121 | YAP_Exit(1); |
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| 122 | |
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| 123 | if (YAP_RunGoal(YAP_MkAtomTerm(YAP_LookupAtom("source")))) { |
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[202a7f9] | 124 | if(debug) printf("calling source..\n"); |
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[53e540d] | 125 | } else { |
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[202a7f9] | 126 | if(debug) printf("calling source failed..\n"); |
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| 127 | YAP_Exit(1); |
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[53e540d] | 128 | } |
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| 129 | |
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| 130 | abac_pl_utility(); |
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| 131 | |
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| 132 | abac_pl_t *pl = abac_xmalloc(sizeof(abac_pl_t)); |
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| 133 | pl->fptr=NULL; |
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| 134 | pl->fname=NULL; |
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| 135 | pl->yap_certs=NULL; |
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| 136 | return pl; |
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[e95d652] | 137 | } |
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| 138 | |
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[53e540d] | 139 | /** |
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[202a7f9] | 140 | * Add a credential to the db |
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[53e540d] | 141 | */ |
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| 142 | int abac_pl_add_credential(abac_pl_t *pl, abac_credential_t *cred) |
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| 143 | { |
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| 144 | int rc=0; |
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[202a7f9] | 145 | abac_list_t *clauses=abac_credential_clauses(cred); |
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| 146 | if (clauses != NULL) { |
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| 147 | char *cur; |
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| 148 | abac_list_foreach(clauses, cur, |
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| 149 | if(cur) { |
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| 150 | if(debug) printf("inserting =>%s\n",cur); |
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| 151 | rc=_insert_cred_clause(cur); |
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| 152 | } |
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| 153 | ); |
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[53e540d] | 154 | } |
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| 155 | return rc; |
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| 156 | } |
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[e95d652] | 157 | |
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[8bd77b5] | 158 | int abac_pl_add_type_credential(abac_pl_t *pl, abac_id_credential_t *id_cert) |
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[202a7f9] | 159 | { |
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| 160 | char *clause=abac_id_clause(id_cert); |
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| 161 | if (clause != NULL) { |
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| 162 | int rc=_insert_cred_clause(clause); |
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| 163 | return rc; |
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| 164 | } |
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| 165 | return 0; |
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| 166 | } |
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| 167 | |
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[d5bbd3e] | 168 | /* string1(S):- S="abc";S="efg";S="ijk" */ |
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[7b548fa] | 169 | char *abac_pl_add_range_constraint_clause(char *var, char *tmplist) |
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[d5bbd3e] | 170 | { |
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| 171 | int i=_get_next_constraint_label_idx(); |
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| 172 | char *tmp=NULL; |
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| 173 | asprintf(&tmp,"%s_%d(%s) :- %s", constraint_label, i, var, tmplist); |
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| 174 | int rc=_insert_cred_clause(tmp); |
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| 175 | free(tmp); |
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| 176 | if(rc) |
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[7b548fa] | 177 | panic("abac_pl_add_range_constraint_clause, failed to insert"); |
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[d5bbd3e] | 178 | asprintf(&tmp,"%s_%d(%s)", constraint_label, i, var); |
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| 179 | return tmp; |
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| 180 | } |
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| 181 | |
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[da5afdf] | 182 | /* cases, |
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[e95d652] | 183 | ['str'] |
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| 184 | ['str1','str2'] |
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| 185 | ([] is not possible, and don't care) |
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| 186 | */ |
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[202a7f9] | 187 | static void _credentials_from_string(abac_stack_t *credentials,char *slist) { |
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[e95d652] | 188 | char *cptr=slist; /* current ptr */ |
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| 189 | char *sptr; /* string ptr */ |
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| 190 | char *ptr; |
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[202a7f9] | 191 | int len=0; |
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[e95d652] | 192 | char *string; |
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| 193 | abac_credential_t *cred=NULL; |
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[202a7f9] | 194 | int cnt=0; |
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| 195 | |
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[e95d652] | 196 | /* find first [' */ |
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| 197 | ptr=strstr(cptr,"['"); |
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| 198 | if(ptr == NULL) |
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| 199 | return; |
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| 200 | cptr=ptr+2; |
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| 201 | sptr=cptr; |
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| 202 | while (1) { |
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| 203 | /* find next ',' or '] */ |
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| 204 | ptr=strstr(cptr,"','"); |
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| 205 | if(ptr!=NULL) { |
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| 206 | cptr=ptr+3; |
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[202a7f9] | 207 | len=(ptr-sptr); |
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[e95d652] | 208 | string=strndup(sptr,len); |
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| 209 | cred=abac_credential_lookup(string); |
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[202a7f9] | 210 | free(string); |
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[e95d652] | 211 | if(cred) { |
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[7b548fa] | 212 | int i=abac_stack_unique_push(credentials, cred); |
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| 213 | if(i) cnt++; |
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[e95d652] | 214 | } else { |
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| 215 | printf("BAD BAD BAD\n"); |
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| 216 | } |
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| 217 | sptr=cptr; |
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| 218 | } else { |
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| 219 | ptr=strstr(cptr,"']"); |
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| 220 | if(ptr!=NULL) { |
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[202a7f9] | 221 | len=(ptr-sptr); |
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[e95d652] | 222 | string=strndup(sptr,len); |
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| 223 | cred=abac_credential_lookup(string); |
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[202a7f9] | 224 | free(string); |
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[e95d652] | 225 | if(cred) { |
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[7b548fa] | 226 | int i=abac_stack_unique_push(credentials, cred); |
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| 227 | if(i) cnt++; |
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[e95d652] | 228 | } else { |
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| 229 | printf("BAD BAD BAD\n"); |
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| 230 | } |
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| 231 | break; |
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| 232 | } |
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| 233 | } |
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| 234 | } |
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[202a7f9] | 235 | if(debug) |
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| 236 | printf("DEBUG:total %d credentials\n", cnt); |
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[e95d652] | 237 | } |
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| 238 | |
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[9335cfa] | 239 | /* make a query and extract just 1 set of result */ |
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[7727f26] | 240 | static abac_stack_t *_make_yap_query(char *prin, char *rule, char* estring) |
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[e95d652] | 241 | { |
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[36b100a] | 242 | YAP_Term *eterm0; |
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| 243 | YAP_Term *eterm1; |
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[e95d652] | 244 | YAP_Term arg[3]; |
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[da5afdf] | 245 | char tmp[5000]; |
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[202a7f9] | 246 | abac_stack_t *cred_list = abac_stack_new(); |
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| 247 | |
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[7727f26] | 248 | if(debug) printf(" the principal part(%s)\n", prin); |
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| 249 | if(prin[0]=='\'' || prin[0]=='"') { |
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| 250 | arg[0]=YAP_ReadBuffer(prin,eterm0); |
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[36b100a] | 251 | } else { |
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[7727f26] | 252 | arg[0]=YAP_MkAtomTerm(YAP_LookupAtom(prin)); |
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[36b100a] | 253 | } |
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| 254 | if(debug) printf(" the role/oset part(%s)\n", estring); |
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| 255 | arg[1]=YAP_ReadBuffer(estring,eterm1); |
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| 256 | |
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| 257 | /* var for credential list */ |
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[da5afdf] | 258 | arg[2]=YAP_MkVarTerm(); |
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[36b100a] | 259 | |
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[da5afdf] | 260 | YAP_Atom f = YAP_LookupAtom("isMember"); |
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| 261 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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| 262 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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| 263 | |
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| 264 | int rc =YAP_RunGoal( goal ); |
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| 265 | if (rc) { |
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| 266 | printf("YAP query succeed\n"); |
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| 267 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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| 268 | /* this is returned as ['string1','string2'] */ |
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[7b548fa] | 269 | if(debug) printf(" query answer : %s\n", tmp); |
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[da5afdf] | 270 | _credentials_from_string(cred_list,tmp); |
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[9335cfa] | 271 | /**** XXX |
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[da5afdf] | 272 | while (YAP_RestartGoal()) { |
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| 273 | if(debug) printf("another success\n"); |
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| 274 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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[7b548fa] | 275 | if(debug) printf(" restart query answer : %s\n", tmp); |
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[da5afdf] | 276 | _credentials_from_string(cred_list,tmp); |
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| 277 | } |
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[9335cfa] | 278 | ***/ |
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[da5afdf] | 279 | } else { |
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| 280 | printf("YAP query failed\n"); |
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| 281 | /* YAP_Exit(1); */ |
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| 282 | } |
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| 283 | return cred_list; |
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| 284 | } |
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| 285 | |
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| 286 | /* 2 types |
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| 287 | acme.buys_rocket <- coyote (coyote=prin, acme.buys_rocket=role) |
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| 288 | ==> isMember(coyote,role(acme,buys_rocket), L) |
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[440ba20] | 289 | acme.buys_rocket <- acme.preferred_customer -- NOT valid |
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| 290 | */ |
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[8bd77b5] | 291 | static abac_stack_t *_query_with_aspect(abac_pl_t *pl, abac_aspect_t* head, abac_aspect_t* tail) |
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[da5afdf] | 292 | { |
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| 293 | char tmp[5000]; |
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| 294 | abac_stack_t *ret=NULL; |
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| 295 | |
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| 296 | if(debug) |
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[440ba20] | 297 | show_yap_db("DEBUG:calling within _query_with_aspect"); |
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[da5afdf] | 298 | |
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[d037f54] | 299 | char *nm; |
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| 300 | PROLOG(nm=abac_aspect_principal_name(head);); |
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[8bd77b5] | 301 | |
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[da5afdf] | 302 | /* could be obj or principal */ |
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[7727f26] | 303 | char *prin_nm=NULL; |
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[8bd77b5] | 304 | if(abac_aspect_is_object(tail)) { |
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| 305 | prin_nm=abac_aspect_object_name(tail); |
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[da5afdf] | 306 | } else { |
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[d037f54] | 307 | PROLOG(prin_nm=abac_aspect_principal_name(tail);); |
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[da5afdf] | 308 | } |
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| 309 | |
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[8bd77b5] | 310 | if(abac_aspect_aspect_name(tail)!=NULL) { |
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| 311 | printf("fail, a.o <- b.o and a.r <- a.r query is not implemented yet !!!\n"); |
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[da5afdf] | 312 | YAP_Exit(1); |
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| 313 | } |
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| 314 | |
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[8bd77b5] | 315 | if (prin_nm == NULL || nm == NULL) { |
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| 316 | printf("fail, query's call got bad aspect names .. \n"); |
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[da5afdf] | 317 | YAP_Exit(1); |
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| 318 | } |
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| 319 | |
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| 320 | if(debug) printf("printing up the yap query ..\n"); |
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[d037f54] | 321 | |
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| 322 | char *pstring; |
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| 323 | PROLOG(pstring=abac_aspect_aspect_param_string(head);); |
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| 324 | |
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[8bd77b5] | 325 | char *stub=abac_aspect_type_string(head); |
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[da5afdf] | 326 | if(pstring) { |
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[8bd77b5] | 327 | sprintf(tmp,"%s(%s,%s,%s)", stub, nm, abac_aspect_aspect_name(head),pstring); |
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[da5afdf] | 328 | free(pstring); |
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| 329 | } else { |
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[8bd77b5] | 330 | sprintf(tmp,"%s(%s,%s)", stub, nm, abac_aspect_aspect_name(head)); |
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[da5afdf] | 331 | } |
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| 332 | |
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[8bd77b5] | 333 | ret=_make_yap_query(prin_nm,nm,tmp); |
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[da5afdf] | 334 | return ret; |
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| 335 | } |
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| 336 | |
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| 337 | /** |
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| 338 | * Get all the credentials (attribute/issuer cert pairs) from prolog |
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| 339 | * (which returns in string form) |
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| 340 | */ |
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| 341 | abac_stack_t *abac_pl_credentials(abac_pl_t *pl) |
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| 342 | { |
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[8bd77b5] | 343 | abac_stack_t *ret=abac_verifier_dump_creds(); |
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[da5afdf] | 344 | return ret; |
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| 345 | } |
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| 346 | |
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[e95d652] | 347 | /** |
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| 348 | * Make a query into prolog db |
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| 349 | --role acme.preferred_customer --principal coyote |
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| 350 | --role acme.prefer_customer.buy_rockets --principlal coyote |
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[da5afdf] | 351 | --oset acme.rockets -- object mrx-21 |
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| 352 | --oset acme.villans -- principal coyote |
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[e95d652] | 353 | */ |
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[da5afdf] | 354 | abac_stack_t *abac_pl_query(abac_pl_t *pl, char *roleoset, char *prinobj) |
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[e95d652] | 355 | { |
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[202a7f9] | 356 | abac_stack_t *ret=NULL; |
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[da5afdf] | 357 | int len=strlen(roleoset)+strlen(prinobj)+5; |
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| 358 | char* attr_string=(char *) abac_xmalloc(sizeof(char)*len); |
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| 359 | sprintf(attr_string,"%s<-%s", roleoset, prinobj); |
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| 360 | |
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| 361 | if(debug) |
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| 362 | printf("abac_pl_query, query string is (%s)\n",attr_string); |
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[e95d652] | 363 | |
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[da5afdf] | 364 | /* call into yacc parser */ |
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| 365 | abac_reset_yyfptr(attr_string); |
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[b5a3da4] | 366 | abac_yy_init(); |
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[da5afdf] | 367 | int rc=yyparse(); |
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| 368 | if (rc) { |
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| 369 | free(attr_string); |
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[e95d652] | 370 | return NULL; |
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| 371 | } |
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| 372 | |
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[8bd77b5] | 373 | abac_aspect_t *head_aspect = abac_yy_get_rule_head_aspect(); |
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| 374 | abac_aspect_t *tail_aspect = abac_yy_get_rule_tail_aspect(); |
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| 375 | ret=_query_with_aspect(pl,head_aspect,tail_aspect); |
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| 376 | |
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[e95d652] | 377 | return ret; |
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| 378 | } |
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| 379 | |
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| 380 | void abac_pl_free(abac_pl_t *pl) { |
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| 381 | if(pl->fptr) { |
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| 382 | fflush(pl->fptr); |
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| 383 | free(pl->fptr); |
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| 384 | } |
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| 385 | if(pl->fname) { |
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| 386 | unlink(pl->fname); |
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| 387 | free(pl->fname); |
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| 388 | } |
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| 389 | free(pl); |
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| 390 | } |
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| 391 | |
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