[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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[2485307] | 124 | if(debug) fprintf(stderr, "calling source..\n"); |
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[53e540d] | 125 | } else { |
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[2485307] | 126 | if(debug) fprintf(stderr,"calling source failed..\n"); |
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[202a7f9] | 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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[5730a10] | 140 | * Add a credential to the db, not duplicating a copy and so |
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| 141 | * don't try to free it after this call. |
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[53e540d] | 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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[202a7f9] | 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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[2485307] | 151 | if(debug) fprintf(stderr,"inserting =>%s\n",cur); |
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[202a7f9] | 152 | rc=_insert_cred_clause(cur); |
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| 153 | } |
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| 154 | ); |
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[53e540d] | 155 | } |
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| 156 | return rc; |
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| 157 | } |
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[e95d652] | 158 | |
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[8bd77b5] | 159 | int abac_pl_add_type_credential(abac_pl_t *pl, abac_id_credential_t *id_cert) |
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[202a7f9] | 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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[d5bbd3e] | 169 | /* string1(S):- S="abc";S="efg";S="ijk" */ |
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[7b548fa] | 170 | char *abac_pl_add_range_constraint_clause(char *var, char *tmplist) |
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[d5bbd3e] | 171 | { |
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| 172 | int i=_get_next_constraint_label_idx(); |
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| 173 | char *tmp=NULL; |
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| 174 | asprintf(&tmp,"%s_%d(%s) :- %s", constraint_label, i, var, tmplist); |
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| 175 | int rc=_insert_cred_clause(tmp); |
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| 176 | free(tmp); |
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| 177 | if(rc) |
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[7b548fa] | 178 | panic("abac_pl_add_range_constraint_clause, failed to insert"); |
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[d5bbd3e] | 179 | asprintf(&tmp,"%s_%d(%s)", constraint_label, i, var); |
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| 180 | return tmp; |
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| 181 | } |
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| 182 | |
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[da5afdf] | 183 | /* cases, |
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[e95d652] | 184 | ['str'] |
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| 185 | ['str1','str2'] |
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| 186 | ([] is not possible, and don't care) |
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| 187 | */ |
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[202a7f9] | 188 | static void _credentials_from_string(abac_stack_t *credentials,char *slist) { |
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[e95d652] | 189 | char *cptr=slist; /* current ptr */ |
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| 190 | char *sptr; /* string ptr */ |
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| 191 | char *ptr; |
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[202a7f9] | 192 | int len=0; |
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[e95d652] | 193 | char *string; |
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| 194 | abac_credential_t *cred=NULL; |
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[202a7f9] | 195 | int cnt=0; |
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| 196 | |
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[e95d652] | 197 | /* find first [' */ |
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| 198 | ptr=strstr(cptr,"['"); |
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| 199 | if(ptr == NULL) |
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| 200 | return; |
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| 201 | cptr=ptr+2; |
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| 202 | sptr=cptr; |
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| 203 | while (1) { |
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| 204 | /* find next ',' or '] */ |
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| 205 | ptr=strstr(cptr,"','"); |
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| 206 | if(ptr!=NULL) { |
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| 207 | cptr=ptr+3; |
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[202a7f9] | 208 | len=(ptr-sptr); |
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[e95d652] | 209 | string=strndup(sptr,len); |
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| 210 | cred=abac_credential_lookup(string); |
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[202a7f9] | 211 | free(string); |
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[e95d652] | 212 | if(cred) { |
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[7b548fa] | 213 | int i=abac_stack_unique_push(credentials, cred); |
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| 214 | if(i) cnt++; |
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[e95d652] | 215 | } else { |
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[9b43fc3] | 216 | printf("BAD BAD\n"); |
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[e95d652] | 217 | } |
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| 218 | sptr=cptr; |
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| 219 | } else { |
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| 220 | ptr=strstr(cptr,"']"); |
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| 221 | if(ptr!=NULL) { |
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[202a7f9] | 222 | len=(ptr-sptr); |
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[e95d652] | 223 | string=strndup(sptr,len); |
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| 224 | cred=abac_credential_lookup(string); |
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[202a7f9] | 225 | free(string); |
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[e95d652] | 226 | if(cred) { |
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[7b548fa] | 227 | int i=abac_stack_unique_push(credentials, cred); |
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| 228 | if(i) cnt++; |
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[e95d652] | 229 | } else { |
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| 230 | printf("BAD BAD BAD\n"); |
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| 231 | } |
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| 232 | break; |
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| 233 | } |
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| 234 | } |
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| 235 | } |
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[202a7f9] | 236 | if(debug) |
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[2485307] | 237 | fprintf(stderr,"DEBUG:total %d credentials\n", cnt); |
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| 238 | } |
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| 239 | |
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| 240 | /* MAX 1024x1024, double as it goes */ |
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| 241 | static int try_again(int sz, char **tptr) |
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| 242 | { |
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| 243 | int blk=1024*2; /* 2048 */ |
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| 244 | int max=1024*1024; |
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| 245 | int size; |
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| 246 | char *tmp = NULL; |
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| 247 | |
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| 248 | if(sz==0) { |
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| 249 | size = (sizeof(char) * (blk+1)); |
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| 250 | } else { |
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| 251 | if (sz>=max) { |
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| 252 | size=0; |
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| 253 | *tptr=tmp; |
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| 254 | return 0; |
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| 255 | } |
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| 256 | size=sz*2+1; |
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| 257 | if(size > max) size=max; |
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| 258 | } |
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| 259 | |
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| 260 | tmp = (char *) YAP_AllocSpaceFromYap(size); |
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| 261 | if(tmp==NULL) { |
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| 262 | fprintf(stderr,"ERROR: malloc failed !!!\n"); |
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| 263 | YAP_Exit(1); |
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| 264 | } |
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| 265 | *tptr=tmp; |
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| 266 | return size; |
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[e95d652] | 267 | } |
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| 268 | |
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[9335cfa] | 269 | /* make a query and extract just 1 set of result */ |
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[7727f26] | 270 | static abac_stack_t *_make_yap_query(char *prin, char *rule, char* estring) |
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[e95d652] | 271 | { |
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[36b100a] | 272 | YAP_Term *eterm0; |
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| 273 | YAP_Term *eterm1; |
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[e95d652] | 274 | YAP_Term arg[3]; |
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[2485307] | 275 | |
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[202a7f9] | 276 | abac_stack_t *cred_list = abac_stack_new(); |
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| 277 | |
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[2485307] | 278 | if(debug) fprintf(stderr," the principal part(%s)\n", prin); |
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[7727f26] | 279 | if(prin[0]=='\'' || prin[0]=='"') { |
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| 280 | arg[0]=YAP_ReadBuffer(prin,eterm0); |
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[36b100a] | 281 | } else { |
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[7727f26] | 282 | arg[0]=YAP_MkAtomTerm(YAP_LookupAtom(prin)); |
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[36b100a] | 283 | } |
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[2485307] | 284 | if(debug) fprintf(stderr," the role/oset part(%s)\n", estring); |
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[36b100a] | 285 | arg[1]=YAP_ReadBuffer(estring,eterm1); |
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| 286 | |
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| 287 | /* var for credential list */ |
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[da5afdf] | 288 | arg[2]=YAP_MkVarTerm(); |
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[36b100a] | 289 | |
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[da5afdf] | 290 | YAP_Atom f = YAP_LookupAtom("isMember"); |
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| 291 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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| 292 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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| 293 | |
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| 294 | int rc =YAP_RunGoal( goal ); |
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| 295 | if (rc) { |
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| 296 | printf("YAP query succeed\n"); |
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[2485307] | 297 | char *tmp=NULL; |
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| 298 | int tmp_sz=try_again(0, &tmp); |
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| 299 | while(1) { |
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[08b8da7] | 300 | int wrc=YAP_WriteBuffer(arg[2], tmp, tmp_sz,YAP_WRITE_HANDLE_VARS); |
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| 301 | /* if t is FALSE, then it is error !!! */ |
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| 302 | if( wrc ) { |
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| 303 | fprintf(stderr," PANIC PANIC\n"); |
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| 304 | /* YAP_Exit(1); */ |
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| 305 | } |
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[2485307] | 306 | if(strlen(tmp) > 5 ) |
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| 307 | break; |
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| 308 | tmp_sz=try_again(tmp_sz,&tmp); |
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| 309 | if(tmp_sz==0) break; |
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| 310 | } |
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[da5afdf] | 311 | /* this is returned as ['string1','string2'] */ |
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[2485307] | 312 | if(debug) fprintf(stderr," query answer : %s(%d)\n", tmp, strlen(tmp)); |
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[da5afdf] | 313 | _credentials_from_string(cred_list,tmp); |
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[2485307] | 314 | if(abac_stack_size(cred_list)==0) { |
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| 315 | fprintf(stderr,"CAN NOT retrieve result properly from YAP!!!\n"); |
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| 316 | YAP_Exit(1); |
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| 317 | } |
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[b92a620] | 318 | YAP_FreeSpaceFromYap(tmp); |
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[9335cfa] | 319 | /**** XXX |
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[da5afdf] | 320 | while (YAP_RestartGoal()) { |
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[2485307] | 321 | if(debug) fprintf(stderr,"another success\n"); |
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[da5afdf] | 322 | YAP_WriteBuffer(arg[2], tmp, 5000,YAP_WRITE_HANDLE_VARS); |
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[2485307] | 323 | if(debug) fprintf(stderr," restart query answer : %s\n", tmp); |
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[da5afdf] | 324 | _credentials_from_string(cred_list,tmp); |
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| 325 | } |
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[9335cfa] | 326 | ***/ |
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[da5afdf] | 327 | } else { |
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| 328 | printf("YAP query failed\n"); |
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| 329 | /* YAP_Exit(1); */ |
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| 330 | } |
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[08b8da7] | 331 | /*** MEI ***/ |
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| 332 | YAP_Reset(); |
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[da5afdf] | 333 | return cred_list; |
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| 334 | } |
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| 335 | |
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| 336 | /* 2 types |
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| 337 | acme.buys_rocket <- coyote (coyote=prin, acme.buys_rocket=role) |
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| 338 | ==> isMember(coyote,role(acme,buys_rocket), L) |
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[440ba20] | 339 | acme.buys_rocket <- acme.preferred_customer -- NOT valid |
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| 340 | */ |
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[8bd77b5] | 341 | static abac_stack_t *_query_with_aspect(abac_pl_t *pl, abac_aspect_t* head, abac_aspect_t* tail) |
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[da5afdf] | 342 | { |
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| 343 | abac_stack_t *ret=NULL; |
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[2485307] | 344 | char *tmp=NULL; |
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[da5afdf] | 345 | |
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[08b8da7] | 346 | if(0) |
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[440ba20] | 347 | show_yap_db("DEBUG:calling within _query_with_aspect"); |
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[da5afdf] | 348 | |
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[d037f54] | 349 | char *nm; |
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| 350 | PROLOG(nm=abac_aspect_principal_name(head);); |
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[8bd77b5] | 351 | |
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[da5afdf] | 352 | /* could be obj or principal */ |
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[7727f26] | 353 | char *prin_nm=NULL; |
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[8bd77b5] | 354 | if(abac_aspect_is_object(tail)) { |
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| 355 | prin_nm=abac_aspect_object_name(tail); |
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[da5afdf] | 356 | } else { |
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[d037f54] | 357 | PROLOG(prin_nm=abac_aspect_principal_name(tail);); |
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[da5afdf] | 358 | } |
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| 359 | |
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[8bd77b5] | 360 | if(abac_aspect_aspect_name(tail)!=NULL) { |
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| 361 | printf("fail, a.o <- b.o and a.r <- a.r query is not implemented yet !!!\n"); |
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[da5afdf] | 362 | YAP_Exit(1); |
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| 363 | } |
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| 364 | |
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[8bd77b5] | 365 | if (prin_nm == NULL || nm == NULL) { |
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| 366 | printf("fail, query's call got bad aspect names .. \n"); |
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[da5afdf] | 367 | YAP_Exit(1); |
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| 368 | } |
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| 369 | |
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[2485307] | 370 | if(debug) fprintf(stderr,"printing up the yap query ..\n"); |
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[d037f54] | 371 | |
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| 372 | char *pstring; |
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| 373 | PROLOG(pstring=abac_aspect_aspect_param_string(head);); |
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| 374 | |
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[8bd77b5] | 375 | char *stub=abac_aspect_type_string(head); |
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[da5afdf] | 376 | if(pstring) { |
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[2485307] | 377 | asprintf(&tmp,"%s(%s,%s,%s)", stub, nm, abac_aspect_aspect_name(head),pstring); |
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[da5afdf] | 378 | free(pstring); |
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| 379 | } else { |
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[2485307] | 380 | asprintf(&tmp,"%s(%s,%s)", stub, nm, abac_aspect_aspect_name(head)); |
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[da5afdf] | 381 | } |
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| 382 | |
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[8bd77b5] | 383 | ret=_make_yap_query(prin_nm,nm,tmp); |
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[da5afdf] | 384 | return ret; |
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| 385 | } |
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| 386 | |
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| 387 | /** |
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| 388 | * Get all the credentials (attribute/issuer cert pairs) from prolog |
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| 389 | * (which returns in string form) |
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| 390 | */ |
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| 391 | abac_stack_t *abac_pl_credentials(abac_pl_t *pl) |
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| 392 | { |
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[8bd77b5] | 393 | abac_stack_t *ret=abac_verifier_dump_creds(); |
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[da5afdf] | 394 | return ret; |
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| 395 | } |
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| 396 | |
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[5110d42] | 397 | abac_stack_t *abac_pl_principals(abac_pl_t *pl) |
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| 398 | { |
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| 399 | abac_stack_t *ret=abac_verifier_dump_principals(); |
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| 400 | return ret; |
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| 401 | } |
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| 402 | |
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[e95d652] | 403 | /** |
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| 404 | * Make a query into prolog db |
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| 405 | --role acme.preferred_customer --principal coyote |
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| 406 | --role acme.prefer_customer.buy_rockets --principlal coyote |
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[da5afdf] | 407 | --oset acme.rockets -- object mrx-21 |
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| 408 | --oset acme.villans -- principal coyote |
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[e95d652] | 409 | */ |
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[da5afdf] | 410 | abac_stack_t *abac_pl_query(abac_pl_t *pl, char *roleoset, char *prinobj) |
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[e95d652] | 411 | { |
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[202a7f9] | 412 | abac_stack_t *ret=NULL; |
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[da5afdf] | 413 | int len=strlen(roleoset)+strlen(prinobj)+5; |
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| 414 | char* attr_string=(char *) abac_xmalloc(sizeof(char)*len); |
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| 415 | sprintf(attr_string,"%s<-%s", roleoset, prinobj); |
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| 416 | |
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| 417 | if(debug) |
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[2485307] | 418 | fprintf(stderr,"abac_pl_query, query string is (%s)\n",attr_string); |
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[e95d652] | 419 | |
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[da5afdf] | 420 | /* call into yacc parser */ |
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| 421 | abac_reset_yyfptr(attr_string); |
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[b5a3da4] | 422 | abac_yy_init(); |
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[da5afdf] | 423 | int rc=yyparse(); |
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| 424 | if (rc) { |
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| 425 | free(attr_string); |
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[e95d652] | 426 | return NULL; |
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| 427 | } |
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| 428 | |
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[8bd77b5] | 429 | abac_aspect_t *head_aspect = abac_yy_get_rule_head_aspect(); |
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| 430 | abac_aspect_t *tail_aspect = abac_yy_get_rule_tail_aspect(); |
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[2efdff5] | 431 | |
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[8bd77b5] | 432 | ret=_query_with_aspect(pl,head_aspect,tail_aspect); |
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| 433 | |
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[e95d652] | 434 | return ret; |
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| 435 | } |
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| 436 | |
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[d9c3886] | 437 | abac_stack_t *abac_pl_query_with_structure(abac_pl_t *pl, abac_aspect_t *head_aspect, abac_aspect_t *tail_aspect) |
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| 438 | { |
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| 439 | abac_stack_t *ret=NULL; |
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| 440 | ret=_query_with_aspect(pl,head_aspect,tail_aspect); |
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| 441 | |
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| 442 | return ret; |
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| 443 | } |
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| 444 | |
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[e95d652] | 445 | void abac_pl_free(abac_pl_t *pl) { |
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| 446 | if(pl->fptr) { |
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| 447 | fflush(pl->fptr); |
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| 448 | free(pl->fptr); |
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| 449 | } |
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| 450 | if(pl->fname) { |
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| 451 | unlink(pl->fname); |
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| 452 | free(pl->fname); |
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| 453 | } |
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| 454 | free(pl); |
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| 455 | } |
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| 456 | |
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