[8bd77b5] | 1 | |
---|
| 2 | /** |
---|
| 3 | ** abac_attribute.c |
---|
| 4 | **/ |
---|
| 5 | |
---|
| 6 | #include <assert.h> |
---|
| 7 | #include <ctype.h> |
---|
| 8 | #include <string.h> |
---|
| 9 | #include <time.h> |
---|
| 10 | |
---|
| 11 | #include "abac_internal.h" |
---|
| 12 | #include "abac_util.h" |
---|
| 13 | |
---|
| 14 | #define SHA1_LENGTH 40 |
---|
| 15 | |
---|
| 16 | extern char* abac_encode_string(char*); |
---|
| 17 | |
---|
| 18 | static int debug=0; |
---|
| 19 | |
---|
| 20 | struct _abac_attribute_t { |
---|
| 21 | abac_id_t *issuer_id; |
---|
| 22 | abac_aspect_t *head; |
---|
| 23 | abac_aspect_t *tail; |
---|
| 24 | int validity; |
---|
| 25 | certificate_t *cert; // NULL until baked |
---|
| 26 | certificate_t *issuer_cert; |
---|
| 27 | |
---|
| 28 | int refcount; |
---|
| 29 | }; |
---|
| 30 | |
---|
| 31 | /********************************************************************/ |
---|
[5d06689] | 32 | char *get_cred_encoding(abac_attribute_t *ptr) |
---|
[8bd77b5] | 33 | { |
---|
| 34 | char *encoding=NULL; |
---|
| 35 | |
---|
| 36 | /* must have a head aspect and tail aspect */ |
---|
| 37 | assert(ptr->head != NULL); |
---|
| 38 | assert(ptr->tail != NULL); |
---|
| 39 | |
---|
| 40 | char *head_string=abac_aspect_typed_string_with_condition(ptr->head); |
---|
| 41 | char *tail_string=abac_aspect_typed_string_with_condition(ptr->tail); |
---|
| 42 | |
---|
| 43 | asprintf(&encoding,"%s<-%s", head_string,tail_string); |
---|
| 44 | char* base64_encoding=abac_encode_string(encoding); |
---|
| 45 | |
---|
| 46 | if(debug) printf("XXX abac_attribute_bake (%s)\n", encoding); |
---|
| 47 | |
---|
| 48 | free(encoding); |
---|
| 49 | free(head_string); |
---|
| 50 | free(tail_string); |
---|
| 51 | return base64_encoding; |
---|
| 52 | } |
---|
| 53 | |
---|
| 54 | /********************************************************************/ |
---|
| 55 | abac_attribute_t *abac_attribute_new(abac_id_t *issuer, certificate_t *cert, |
---|
| 56 | certificate_t *issuer_cert) |
---|
| 57 | { |
---|
| 58 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
---|
| 59 | ptr->issuer_id = abac_id_dup(issuer); |
---|
| 60 | ptr->head = NULL; |
---|
| 61 | ptr->tail = NULL; |
---|
| 62 | ptr->validity= 365 * 86400; // default |
---|
| 63 | ptr->cert=cert; // already baked.. |
---|
| 64 | ptr->issuer_cert=issuer_cert; |
---|
| 65 | ptr->refcount=1; |
---|
| 66 | |
---|
| 67 | return ptr; |
---|
| 68 | } |
---|
| 69 | |
---|
| 70 | // validity is measured in seconds (as of 0.2.0) |
---|
| 71 | int abac_attribute_create(abac_attribute_t **ret, |
---|
| 72 | abac_aspect_t *head, abac_aspect_t *tail, int validity) |
---|
| 73 | { |
---|
| 74 | abac_id_t *issuer_id=abac_aspect_get_issuer_id(head); |
---|
| 75 | char *name=abac_aspect_aspect_name(head); |
---|
| 76 | |
---|
| 77 | if (abac_id_privkey(issuer_id) == NULL) |
---|
| 78 | return ABAC_ATTRIBUTE_ISSUER_NOKEY; |
---|
| 79 | if (!abac_validate_clean_aspect_name(name)) |
---|
| 80 | return ABAC_ATTRIBUTE_INVALID_ROLE; |
---|
| 81 | if (validity < 0) |
---|
| 82 | return ABAC_ATTRIBUTE_INVALID_VALIDITY; |
---|
| 83 | |
---|
| 84 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
---|
| 85 | ptr->issuer_id = abac_id_dup(issuer_id); |
---|
| 86 | ptr->head = abac_aspect_dup(head); |
---|
| 87 | ptr->tail = (tail!=NULL) ? abac_aspect_dup(tail):NULL; |
---|
| 88 | ptr->validity=(validity==0?(365 * 86400):validity); |
---|
| 89 | |
---|
| 90 | // NULL until baked |
---|
| 91 | ptr->cert=NULL; |
---|
| 92 | ptr->issuer_cert=NULL; |
---|
| 93 | ptr->refcount=1; |
---|
| 94 | *ret = ptr; |
---|
| 95 | return ABAC_ATTRIBUTE_SUCCESS; |
---|
| 96 | } |
---|
| 97 | |
---|
| 98 | // validity is measured in seconds (as of 0.2.0) |
---|
| 99 | int abac_attribute_create_creddy(abac_attribute_t **ret, abac_id_t *issuer, |
---|
| 100 | abac_aspect_t *head_aspect, abac_aspect_t *tail_aspect, char *name, int validity) |
---|
| 101 | { |
---|
| 102 | if (abac_id_privkey(issuer) == NULL) |
---|
| 103 | return ABAC_ATTRIBUTE_ISSUER_NOKEY; |
---|
| 104 | if (!abac_validate_clean_aspect_name(name)) |
---|
| 105 | return ABAC_ATTRIBUTE_INVALID_ROLE; |
---|
| 106 | if (validity < 0) |
---|
| 107 | return ABAC_ATTRIBUTE_INVALID_VALIDITY; |
---|
| 108 | |
---|
| 109 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
---|
| 110 | ptr->issuer_id = abac_id_dup(issuer); |
---|
| 111 | |
---|
| 112 | ptr->head=head_aspect; |
---|
| 113 | ptr->tail=tail_aspect; |
---|
| 114 | ptr->validity = validity; |
---|
| 115 | |
---|
| 116 | // NULL until baked |
---|
| 117 | ptr->cert = NULL; |
---|
| 118 | ptr->issuer_cert = NULL; |
---|
| 119 | *ret = ptr; |
---|
| 120 | return ABAC_ATTRIBUTE_SUCCESS; |
---|
| 121 | } |
---|
| 122 | |
---|
| 123 | int abac_attribute_bake(abac_attribute_t *ptr) { |
---|
| 124 | assert(ptr); |
---|
| 125 | |
---|
[5d06689] | 126 | char *cred_encoding = get_cred_encoding(ptr); |
---|
[8bd77b5] | 127 | |
---|
| 128 | // create attribute cert |
---|
| 129 | time_t not_before = time(NULL); |
---|
| 130 | time_t not_after = not_before + ptr->validity; |
---|
| 131 | chunk_t serial = abac_generate_serial(); |
---|
| 132 | |
---|
| 133 | certificate_t *attr_cert = lib->creds->create(lib->creds, |
---|
| 134 | CRED_CERTIFICATE, CERT_X509_AC, |
---|
| 135 | BUILD_CERT, abac_id_cert(ptr->issuer_id), |
---|
| 136 | BUILD_NOT_BEFORE_TIME, not_before, |
---|
| 137 | BUILD_NOT_AFTER_TIME, not_after, |
---|
| 138 | BUILD_SERIAL, serial, |
---|
| 139 | BUILD_IETF_GROUP_ATTR, cred_encoding, |
---|
| 140 | BUILD_SIGNING_CERT, abac_id_cert(ptr->issuer_id), |
---|
| 141 | BUILD_SIGNING_KEY, abac_id_privkey(ptr->issuer_id), |
---|
| 142 | BUILD_END |
---|
| 143 | ); |
---|
[d037f54] | 144 | |
---|
[8bd77b5] | 145 | if (attr_cert == NULL) |
---|
| 146 | return 0; |
---|
| 147 | |
---|
| 148 | ptr->cert = attr_cert; |
---|
[137b55f] | 149 | // cert and issuer can be the same, in which case it is the self signing |
---|
[8bd77b5] | 150 | ptr->issuer_cert= attr_cert->get_ref(attr_cert); |
---|
| 151 | |
---|
| 152 | free(cred_encoding); |
---|
| 153 | free(serial.ptr); |
---|
| 154 | return 1; |
---|
| 155 | } |
---|
| 156 | |
---|
| 157 | abac_chunk_t abac_attribute_cert_chunk(abac_attribute_t *ptr) { |
---|
| 158 | assert(ptr->cert); |
---|
[137b55f] | 159 | chunk_t encoding = chunk_empty; |
---|
| 160 | int rc=ptr->cert->get_encoding(ptr->cert,CERT_ASN1_DER,&encoding); |
---|
[8bd77b5] | 161 | abac_chunk_t ret = { encoding.ptr, encoding.len }; |
---|
| 162 | return ret; |
---|
| 163 | } |
---|
| 164 | |
---|
[2efdff5] | 165 | /* just loading it without any verifying */ |
---|
| 166 | certificate_t *abac_attribute_from_file(char *filename) { |
---|
| 167 | |
---|
| 168 | if(!file_exist(filename)) return NULL; |
---|
| 169 | |
---|
| 170 | libabac_init(); |
---|
| 171 | certificate_t *cert = lib->creds->create(lib->creds, |
---|
| 172 | CRED_CERTIFICATE, CERT_X509_AC, |
---|
| 173 | BUILD_FROM_FILE, filename, |
---|
| 174 | BUILD_END |
---|
| 175 | ); |
---|
| 176 | if (cert == NULL) |
---|
| 177 | errx(1, "Couldn't load attribute cert %s", filename); |
---|
| 178 | |
---|
| 179 | return cert; |
---|
| 180 | } |
---|
| 181 | |
---|
| 182 | |
---|
[8bd77b5] | 183 | int abac_attribute_baked(abac_attribute_t *ptr) { |
---|
| 184 | return ptr->cert != NULL; |
---|
| 185 | } |
---|
| 186 | |
---|
| 187 | // returns 0 if the cert hasn't been baked |
---|
[5d06689] | 188 | int abac_attribute_write_cert(abac_attribute_t *ptr, FILE *out) { |
---|
[8bd77b5] | 189 | assert(ptr != NULL); |
---|
| 190 | |
---|
| 191 | if (ptr->cert == NULL) |
---|
| 192 | return 0; |
---|
| 193 | |
---|
| 194 | // write to file |
---|
[137b55f] | 195 | chunk_t encoding = chunk_empty; |
---|
| 196 | int rc=ptr->cert->get_encoding(ptr->cert,CERT_ASN1_DER,&encoding); |
---|
| 197 | |
---|
| 198 | if(rc) { |
---|
| 199 | fwrite(encoding.ptr, encoding.len, 1, out); |
---|
| 200 | free(encoding.ptr); |
---|
| 201 | return 1; |
---|
| 202 | } |
---|
| 203 | return 0; |
---|
[8bd77b5] | 204 | } |
---|
| 205 | |
---|
| 206 | abac_attribute_t *abac_attribute_dup(abac_attribute_t *ptr) |
---|
| 207 | { |
---|
| 208 | assert(ptr); |
---|
| 209 | ++ptr->refcount; |
---|
| 210 | return ptr; |
---|
| 211 | } |
---|
| 212 | |
---|
| 213 | void abac_attribute_free(abac_attribute_t *ptr) { |
---|
| 214 | int i; |
---|
| 215 | |
---|
| 216 | if (ptr == NULL) |
---|
| 217 | return; |
---|
| 218 | |
---|
| 219 | --ptr->refcount; |
---|
| 220 | if (ptr->refcount > 0) |
---|
| 221 | return; |
---|
| 222 | |
---|
| 223 | if(ptr->issuer_id) abac_id_free(ptr->issuer_id); |
---|
| 224 | if(ptr->head) abac_aspect_free(ptr->head); |
---|
| 225 | if(ptr->tail) abac_aspect_free(ptr->tail); |
---|
| 226 | |
---|
| 227 | if(ptr->cert) DESTROY_IF(ptr->cert); |
---|
| 228 | if(ptr->issuer_cert) DESTROY_IF(ptr->issuer_cert); |
---|
| 229 | |
---|
| 230 | free(ptr); |
---|
| 231 | } |
---|
| 232 | |
---|
[5d06689] | 233 | |
---|
| 234 | char *abac_attribute_string(abac_attribute_t *ptr) |
---|
| 235 | { |
---|
| 236 | char *head=abac_aspect_string_with_condition(ptr->head); |
---|
| 237 | char *tail=abac_aspect_string_with_condition(ptr->tail); |
---|
| 238 | if(head==NULL || tail==NULL) |
---|
[2efdff5] | 239 | errx(1, "attribute string, head and tail can not be NULL"); |
---|
[5d06689] | 240 | char *tmp=NULL; |
---|
| 241 | asprintf(&tmp,"%s<-%s",head,tail); |
---|
| 242 | return tmp; |
---|
| 243 | } |
---|
| 244 | char *abac_attribute_typed_string(abac_attribute_t *ptr) |
---|
| 245 | { |
---|
| 246 | char *head=abac_aspect_typed_string_with_condition(ptr->head); |
---|
| 247 | char *tail=abac_aspect_typed_string_with_condition(ptr->tail); |
---|
| 248 | if(head==NULL || tail==NULL) |
---|
[2efdff5] | 249 | errx(1, "attribute typed string, head and tail can not be NULL"); |
---|
[5d06689] | 250 | char *tmp=NULL; |
---|
| 251 | asprintf(&tmp,"%s<-%s",head,tail); |
---|
| 252 | return tmp; |
---|
| 253 | } |
---|
| 254 | |
---|
[8bd77b5] | 255 | /********************************************************************/ |
---|
| 256 | certificate_t *abac_attribute_issuer_cert(abac_attribute_t *ptr) |
---|
| 257 | { |
---|
| 258 | assert(ptr); |
---|
| 259 | return ptr->issuer_cert; |
---|
| 260 | } |
---|
| 261 | |
---|
| 262 | abac_aspect_t *abac_attribute_head(abac_attribute_t *ptr) |
---|
| 263 | { |
---|
| 264 | assert(ptr); |
---|
| 265 | return ptr->head; |
---|
| 266 | } |
---|
| 267 | |
---|
[adc0815] | 268 | bool abac_attribute_is_role(abac_attribute_t *ptr) |
---|
| 269 | { |
---|
| 270 | assert(ptr); |
---|
| 271 | assert(ptr->head); |
---|
| 272 | return abac_aspect_is_role(ptr->head); |
---|
| 273 | } |
---|
| 274 | |
---|
[8bd77b5] | 275 | abac_attribute_t *abac_attribute_set_head(abac_attribute_t *ptr, abac_aspect_t *head) |
---|
| 276 | { |
---|
| 277 | assert(ptr); |
---|
| 278 | ptr->head=head; |
---|
| 279 | return ptr; |
---|
| 280 | } |
---|
| 281 | |
---|
| 282 | abac_aspect_t *abac_attribute_tail(abac_attribute_t *ptr) |
---|
| 283 | { |
---|
| 284 | assert(ptr); |
---|
| 285 | return ptr->tail; |
---|
| 286 | } |
---|
| 287 | |
---|
| 288 | abac_attribute_t *abac_attribute_add_tail(abac_attribute_t *ptr, abac_aspect_t *tail) |
---|
| 289 | { |
---|
| 290 | assert(ptr); |
---|
| 291 | assert(tail); |
---|
| 292 | |
---|
| 293 | /* type of head and tail has to match */ |
---|
| 294 | abac_aspect_t *head=abac_attribute_head(ptr); |
---|
| 295 | if(abac_aspect_is_intersecting(tail)) { |
---|
| 296 | if(debug) { |
---|
| 297 | printf("tail is intersection \n"); |
---|
| 298 | printf("tail is (%s)\n", abac_aspect_string_with_condition(tail)); |
---|
| 299 | } |
---|
| 300 | if(abac_aspect_intersecting_aspect_type(tail) != abac_aspect_aspect_type(head)) |
---|
| 301 | errx(1, "head and tail's aspect type does not match"); |
---|
| 302 | } else { |
---|
| 303 | if(abac_aspect_aspect_type(head) != abac_aspect_aspect_type(tail)) { |
---|
| 304 | if(debug) { |
---|
| 305 | printf("head->(%s)\n",abac_aspect_type_string(head)); |
---|
| 306 | printf("tail->(%s)\n",abac_aspect_type_string(tail)); |
---|
| 307 | printf("tail is (%s)\n", abac_aspect_string_with_condition(tail)); |
---|
| 308 | } |
---|
| 309 | errx(1, "head and tail's aspect type does not match"); |
---|
| 310 | } |
---|
| 311 | } |
---|
| 312 | |
---|
| 313 | if(ptr->tail == NULL) { |
---|
| 314 | ptr->tail=abac_aspect_dup(tail); |
---|
| 315 | } else { |
---|
| 316 | if(abac_aspect_is_intersecting(ptr->tail)) { |
---|
| 317 | abac_aspect_add_intersecting_aspect(ptr->tail, tail); |
---|
| 318 | } else { |
---|
| 319 | /* special case.. if there is a tail there already and it is not an intersecting |
---|
| 320 | tail, need to turn this into an intersecting tails */ |
---|
| 321 | abac_aspect_t *nptr=abac_aspect_intersection_new(ptr->tail); |
---|
| 322 | abac_aspect_add_intersecting_aspect(nptr, tail); |
---|
| 323 | ptr->tail=nptr; |
---|
| 324 | } |
---|
| 325 | } |
---|
| 326 | return ptr; |
---|
| 327 | } |
---|
| 328 | |
---|
| 329 | certificate_t *abac_attribute_cert(abac_attribute_t *ptr) |
---|
| 330 | { |
---|
| 331 | assert(ptr); |
---|
| 332 | return ptr->cert; |
---|
| 333 | } |
---|
| 334 | |
---|
| 335 | int abac_attribute_lastone(abac_attribute_t *ptr) |
---|
| 336 | { |
---|
| 337 | assert(ptr); |
---|
| 338 | if(ptr->refcount == 1) |
---|
| 339 | return 1; |
---|
| 340 | return 0; |
---|
| 341 | } |
---|
| 342 | |
---|
| 343 | |
---|
| 344 | abac_aspect_t **abac_attribute_tail_vectorized(abac_attribute_t *ptr) |
---|
| 345 | { |
---|
| 346 | abac_aspect_t **tails=NULL; |
---|
| 347 | abac_aspect_t *tail=ptr->tail; |
---|
| 348 | abac_list_t *list=NULL; |
---|
| 349 | int cnt=0; |
---|
| 350 | if(tail != NULL) { |
---|
| 351 | if(!abac_aspect_is_intersecting(tail)) { |
---|
| 352 | tails = abac_xmalloc(sizeof(abac_aspect_t *) * 2); |
---|
| 353 | tails[0] = abac_aspect_dup(tail); |
---|
| 354 | tails[1] = NULL; |
---|
| 355 | if(debug) { |
---|
| 356 | printf("abac_attribute_tail_vectorized, only 1 tail\n"); |
---|
| 357 | } |
---|
| 358 | return tails; |
---|
| 359 | } else { |
---|
| 360 | abac_list_t *list=abac_aspect_prereqs(tail); |
---|
| 361 | cnt=abac_list_size(list); |
---|
| 362 | } |
---|
| 363 | } |
---|
| 364 | // make the array (leave space to NULL terminate it) |
---|
| 365 | // n.b., even if the list is empty, we still return an array that |
---|
| 366 | // only contains the NULL terminator |
---|
| 367 | tails = abac_xmalloc(sizeof(abac_aspect_t *) * (cnt + 1)); |
---|
| 368 | abac_aspect_t *cur; |
---|
| 369 | int i = 0; |
---|
| 370 | if(i<cnt) { |
---|
| 371 | abac_list_foreach(list, cur, |
---|
| 372 | tails[i++] = abac_aspect_dup(cur); |
---|
| 373 | ); |
---|
| 374 | } |
---|
| 375 | tails[i] = NULL; |
---|
| 376 | if(debug) |
---|
| 377 | printf("abac_attribute_tail_vectorized, %d tails\n", cnt); |
---|
| 378 | return tails; |
---|
| 379 | } |
---|
| 380 | |
---|
| 381 | void abac_aspects_free(abac_aspect_t **aspects) |
---|
| 382 | { |
---|
| 383 | /* always null terminating */ |
---|
| 384 | assert(aspects); |
---|
| 385 | int i; |
---|
| 386 | for (i = 0; aspects[i] != NULL; ++i) { |
---|
| 387 | abac_aspect_free(aspects[i]); |
---|
| 388 | } |
---|
| 389 | free(aspects); |
---|
| 390 | } |
---|