[e95d652] | 1 | |
---|
| 2 | /* copied from abac_graph.c |
---|
| 3 | implementation of the low level using |
---|
| 4 | yap prolog |
---|
| 5 | */ |
---|
| 6 | |
---|
| 7 | #include <err.h> |
---|
| 8 | #include <stdio.h> |
---|
| 9 | #include <assert.h> |
---|
| 10 | #include <stdlib.h> |
---|
| 11 | #include <string.h> |
---|
| 12 | #include <Yap/YapInterface.h> |
---|
| 13 | |
---|
| 14 | #include "abac_pl.h" |
---|
| 15 | #include "abac_pl_yap.h" |
---|
| 16 | |
---|
| 17 | #include "abac_list.h" |
---|
| 18 | #include "abac_util.h" |
---|
| 19 | |
---|
| 20 | #include "uthash.h" |
---|
| 21 | |
---|
| 22 | static int _insert_clause(char*); |
---|
| 23 | static void _show_yap_db(char*); |
---|
| 24 | |
---|
| 25 | extern char *abac_cn_with_role(abac_role_t *); |
---|
| 26 | |
---|
| 27 | // pl |
---|
| 28 | struct _abac_pl_t { |
---|
| 29 | FILE *fptr; |
---|
| 30 | char *fname; |
---|
| 31 | char *yap_certs; |
---|
| 32 | }; |
---|
| 33 | |
---|
| 34 | /** |
---|
| 35 | * Create a new yap structure. |
---|
| 36 | */ |
---|
| 37 | abac_pl_t *abac_pl_new(void) { |
---|
| 38 | |
---|
| 39 | if (YAP_FastInit(NULL) == YAP_BOOT_ERROR) |
---|
| 40 | YAP_Exit(1); |
---|
| 41 | |
---|
| 42 | if (YAP_RunGoal(YAP_MkAtomTerm(YAP_LookupAtom("source")))) { |
---|
| 43 | printf("calling source..\n"); |
---|
| 44 | } else { |
---|
| 45 | printf("calling source failed..\n"); |
---|
| 46 | YAP_Exit(1); |
---|
| 47 | } |
---|
| 48 | abac_pl_t *pl = abac_xmalloc(sizeof(abac_pl_t)); |
---|
| 49 | pl->fptr=NULL; |
---|
| 50 | pl->fname=NULL; |
---|
| 51 | pl->yap_certs=NULL; |
---|
| 52 | return pl; |
---|
| 53 | } |
---|
| 54 | |
---|
| 55 | /** |
---|
| 56 | * Add a credential to the credential pl. |
---|
| 57 | */ |
---|
| 58 | int abac_pl_add_credential(abac_pl_t *pl, abac_credential_t *cred) |
---|
| 59 | { |
---|
| 60 | int rc=0; |
---|
| 61 | char *str = abac_credential_clause(cred); |
---|
| 62 | if (str != NULL) { |
---|
| 63 | rc=_insert_clause(str); |
---|
| 64 | } |
---|
| 65 | _show_yap_db("calling within abac_pl_add_credential"); |
---|
| 66 | return rc; |
---|
| 67 | } |
---|
| 68 | |
---|
| 69 | static int _insert_clause(char *cstr) |
---|
| 70 | { |
---|
| 71 | int ret=ABAC_CERT_SUCCESS; |
---|
| 72 | YAP_Term *eterm; |
---|
| 73 | YAP_Term goalArgs=YAP_ReadBuffer(cstr, eterm); |
---|
| 74 | char *tmp=YAP_CompileClause(goalArgs); |
---|
| 75 | if (tmp!=NULL) { /* something is wrong */ |
---|
| 76 | printf("error: result of compile clause (%s)\n", tmp); |
---|
| 77 | ret=ABAC_CERT_BAD_YAP; |
---|
| 78 | } |
---|
| 79 | return ret; |
---|
| 80 | } |
---|
| 81 | |
---|
| 82 | static void _show_yap_db(char *msg) |
---|
| 83 | { |
---|
| 84 | char lstr[]="listing"; |
---|
| 85 | YAP_Term *eterm; |
---|
| 86 | |
---|
| 87 | YAP_Term goal=YAP_ReadBuffer(lstr, eterm); |
---|
| 88 | printf("calling listing..from(%s) \n",msg); |
---|
| 89 | int rc =YAP_RunGoal( goal ); |
---|
| 90 | if (rc) { |
---|
| 91 | printf("listing ok.. \n"); |
---|
| 92 | } else { |
---|
| 93 | printf("listing's rc is bad.. \n"); |
---|
| 94 | YAP_Exit(1); |
---|
| 95 | } |
---|
| 96 | } |
---|
| 97 | |
---|
| 98 | static void _set_dbg(abac_pl_t *pl) |
---|
| 99 | { |
---|
| 100 | char *fname=strdup( "/tmp/abac_yap-XXXXXX.pl" ); |
---|
| 101 | int fd = mkstemps( pl->fname, 3 ); |
---|
| 102 | if ( fd == -1) { |
---|
| 103 | printf("Couldn't get a valid temp name %s\n", fname); |
---|
| 104 | free((void*)fname); |
---|
| 105 | YAP_Exit(1); |
---|
| 106 | } |
---|
| 107 | FILE *fptr = fdopen(fd, "w"); |
---|
| 108 | if (fptr == NULL) { |
---|
| 109 | printf("Couldn't open %s for writing\n", fname); |
---|
| 110 | free((void*)fname); |
---|
| 111 | YAP_Exit(1); |
---|
| 112 | } |
---|
| 113 | pl->fptr=fptr; |
---|
| 114 | pl->fname=fname; |
---|
| 115 | } |
---|
| 116 | |
---|
| 117 | static abac_list_t *_linked_query(abac_pl_t *pl, abac_role_t* role, abac_role_t* role_prin ) |
---|
| 118 | { |
---|
| 119 | abac_list_t *cred_list = abac_list_new(); |
---|
| 120 | return cred_list; |
---|
| 121 | } |
---|
| 122 | |
---|
| 123 | static abac_list_t *_intersect_query(abac_pl_t *pl, abac_role_t* role, abac_role_t* role_prin ) |
---|
| 124 | { |
---|
| 125 | abac_list_t *cred_list = abac_list_new(); |
---|
| 126 | return cred_list; |
---|
| 127 | } |
---|
| 128 | |
---|
| 129 | |
---|
| 130 | /* cases, |
---|
| 131 | ['str'] |
---|
| 132 | ['str1','str2'] |
---|
| 133 | ([] is not possible, and don't care) |
---|
| 134 | */ |
---|
| 135 | static void _credentials_from_string(abac_list_t *credentials,char *slist) { |
---|
| 136 | char *cptr=slist; /* current ptr */ |
---|
| 137 | char *sptr; /* string ptr */ |
---|
| 138 | char *ptr; |
---|
| 139 | int len=strlen(ptr); |
---|
| 140 | char *string; |
---|
| 141 | abac_credential_t *cred=NULL; |
---|
| 142 | |
---|
| 143 | /* find first [' */ |
---|
| 144 | ptr=strstr(cptr,"['"); |
---|
| 145 | if(ptr == NULL) |
---|
| 146 | return; |
---|
| 147 | cptr=ptr+2; |
---|
| 148 | sptr=cptr; |
---|
| 149 | while (1) { |
---|
| 150 | /* find next ',' or '] */ |
---|
| 151 | ptr=strstr(cptr,"','"); |
---|
| 152 | if(ptr!=NULL) { |
---|
| 153 | cptr=ptr+3; |
---|
| 154 | len=ptr-sptr; |
---|
| 155 | string=strndup(sptr,len); |
---|
| 156 | printf("string found(%s)\n", string); |
---|
| 157 | cred=abac_credential_lookup(string); |
---|
| 158 | if(cred) { |
---|
| 159 | abac_list_add(credentials, abac_credential_dup(cred)); |
---|
| 160 | } else { |
---|
| 161 | printf("BAD BAD BAD\n"); |
---|
| 162 | } |
---|
| 163 | sptr=cptr; |
---|
| 164 | } else { |
---|
| 165 | ptr=strstr(cptr,"']"); |
---|
| 166 | if(ptr!=NULL) { |
---|
| 167 | len=ptr-sptr; |
---|
| 168 | string=strndup(sptr,len); |
---|
| 169 | printf("last string found(%s)\n", string); |
---|
| 170 | cred=abac_credential_lookup(string); |
---|
| 171 | if(cred) { |
---|
| 172 | abac_list_add(credentials, abac_credential_dup(cred)); |
---|
| 173 | } else { |
---|
| 174 | printf("BAD BAD BAD\n"); |
---|
| 175 | } |
---|
| 176 | break; |
---|
| 177 | } |
---|
| 178 | } |
---|
| 179 | } |
---|
| 180 | } |
---|
| 181 | |
---|
| 182 | /* 2 types |
---|
| 183 | acme.buys_rocket <- coyote |
---|
| 184 | acme.buys_rocket <- acme.preferred_customer -- NOT DONE YET */ |
---|
| 185 | static abac_list_t *_query(abac_pl_t *pl, abac_role_t* role, abac_role_t* role_prin ) |
---|
| 186 | { |
---|
| 187 | YAP_Term *eterm; |
---|
| 188 | YAP_Term arg[3]; |
---|
| 189 | char tmp[1000]; |
---|
| 190 | abac_list_t *cred_list = NULL; |
---|
| 191 | |
---|
| 192 | char *cn_prin=abac_cn_with_role(role_prin); |
---|
| 193 | char *cn_role=abac_cn_with_role(role); |
---|
| 194 | |
---|
| 195 | if(abac_role_role_name(role_prin)!=NULL) { |
---|
| 196 | printf("NOT YET DONE, role_prin is B.R !!!\n"); |
---|
| 197 | YAP_Exit(1); |
---|
| 198 | } |
---|
| 199 | |
---|
| 200 | if (cn_prin == NULL || cn_role == NULL) { |
---|
| 201 | printf("fail, query's call got bad roles.. \n"); |
---|
| 202 | YAP_Exit(1); |
---|
| 203 | } |
---|
| 204 | sprintf(tmp,"role(%s,%s)", cn_role, abac_role_role_name(role)); |
---|
| 205 | arg[0]=YAP_MkAtomTerm(YAP_LookupAtom(cn_prin)); |
---|
| 206 | arg[1]=YAP_ReadBuffer(tmp,eterm); |
---|
| 207 | arg[2]=YAP_MkVarTerm(); |
---|
| 208 | YAP_Atom f = YAP_LookupAtom("isMember"); |
---|
| 209 | YAP_Functor func = YAP_MkFunctor(f, 3); |
---|
| 210 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
---|
| 211 | int rc =YAP_RunGoal( goal ); |
---|
| 212 | if (rc) { |
---|
| 213 | cred_list = abac_list_new(); |
---|
| 214 | printf("success, query call ok.. \n"); |
---|
| 215 | YAP_WriteBuffer(arg[2], tmp, 1000,YAP_WRITE_HANDLE_VARS); |
---|
| 216 | printf(" answer : %s(%d)\n", tmp, strlen(tmp)); |
---|
| 217 | /* this is returned as ['string1','string2'] */ |
---|
| 218 | _credentials_from_string(cred_list,tmp); |
---|
| 219 | while (YAP_RestartGoal()) { |
---|
| 220 | printf("another success\n"); |
---|
| 221 | YAP_WriteBuffer(arg[2], tmp, 1000,YAP_WRITE_HANDLE_VARS); |
---|
| 222 | printf(" answer : %s\n", tmp); |
---|
| 223 | _credentials_from_string(cred_list,tmp); |
---|
| 224 | } |
---|
| 225 | } else { |
---|
| 226 | printf("fail, query's call is bad.. \n"); |
---|
| 227 | YAP_Exit(1); |
---|
| 228 | } |
---|
| 229 | return cred_list; |
---|
| 230 | } |
---|
| 231 | |
---|
| 232 | /** |
---|
| 233 | * Make a query into prolog db |
---|
| 234 | --role acme.preferred_customer --principal coyote |
---|
| 235 | --role acme.prefer_customer.buy_rockets --principlal coyote |
---|
| 236 | */ |
---|
| 237 | abac_list_t *abac_pl_query(abac_pl_t *pl, char *role_name, char *principal) |
---|
| 238 | { |
---|
| 239 | abac_role_t *role = abac_role_from_string(role_name); |
---|
| 240 | abac_role_t *prin_role = abac_role_from_string(principal); |
---|
| 241 | char *query_clause = NULL; |
---|
| 242 | abac_list_t *ret=NULL; |
---|
| 243 | |
---|
| 244 | // give up on bogus roles |
---|
| 245 | if (role == NULL || prin_role == NULL) { |
---|
| 246 | free(role); |
---|
| 247 | free(prin_role); |
---|
| 248 | return NULL; |
---|
| 249 | } |
---|
| 250 | |
---|
| 251 | /* should be using yacc */ |
---|
| 252 | /* if role->prereqs != NULL (&) */ |
---|
| 253 | if (abac_role_is_intersection(role)) { |
---|
| 254 | /* XXX */ |
---|
| 255 | ret=_intersect_query(pl,role,prin_role); |
---|
| 256 | /* prin.role.role1 */ |
---|
| 257 | } else if( abac_role_linked_role(role) ) { |
---|
| 258 | /* XXX */ |
---|
| 259 | ret=_linked_query(pl,role,prin_role); |
---|
| 260 | } else { /* prin.role, */ |
---|
| 261 | ret=_query(pl,role,prin_role); |
---|
| 262 | } |
---|
| 263 | |
---|
| 264 | return ret; |
---|
| 265 | } |
---|
| 266 | |
---|
| 267 | /** |
---|
| 268 | * Get all the credentials (attribute/issuer cert pairs) from prolog |
---|
| 269 | * (which returns in string form) |
---|
| 270 | */ |
---|
| 271 | abac_list_t *abac_pl_credentials(abac_pl_t *pl) { |
---|
| 272 | abac_list_t *credentials = abac_list_new(); |
---|
| 273 | /* fix up a stream to stream the credentials from prolog engine */ |
---|
| 274 | return credentials; |
---|
| 275 | } |
---|
| 276 | |
---|
| 277 | void abac_pl_free(abac_pl_t *pl) { |
---|
| 278 | if(pl->fptr) { |
---|
| 279 | fflush(pl->fptr); |
---|
| 280 | free(pl->fptr); |
---|
| 281 | } |
---|
| 282 | if(pl->fname) { |
---|
| 283 | unlink(pl->fname); |
---|
| 284 | free(pl->fname); |
---|
| 285 | } |
---|
| 286 | free(pl); |
---|
| 287 | } |
---|
| 288 | |
---|