[461541a] | 1 | |
---|
| 2 | /* abac_attribute.c */ |
---|
| 3 | |
---|
| 4 | #define _GNU_SOURCE |
---|
| 5 | #include <stdio.h> |
---|
| 6 | #include <assert.h> |
---|
| 7 | #include <ctype.h> |
---|
| 8 | #include <string.h> |
---|
| 9 | #include <time.h> |
---|
| 10 | |
---|
| 11 | #include "libabac_common.h" |
---|
[4721618] | 12 | #include "abac_list.h" |
---|
[461541a] | 13 | #include "abac_util.h" |
---|
| 14 | #include "abac_xml.h" |
---|
| 15 | |
---|
| 16 | #define ROLE_SEPARATOR " <- " |
---|
| 17 | #define INTERSECTION_SEP " & " |
---|
| 18 | #define SHA1_LENGTH 40 |
---|
| 19 | |
---|
| 20 | static int debug=0; |
---|
| 21 | |
---|
| 22 | // a GENI XML attribute chunk might contain multiple |
---|
| 23 | // attribute rules. It will be translate into multiple |
---|
| 24 | // abac_attribute structures but with cert ptr pointing |
---|
| 25 | // to the same xml chunk |
---|
| 26 | // issuer can be missing but then it won't be bakable |
---|
| 27 | // unless it is baked just for creddy's roles call |
---|
| 28 | struct _abac_attribute_t { |
---|
| 29 | abac_id_t *issuer_id; |
---|
| 30 | char *role; |
---|
| 31 | long validity; |
---|
[ab63ece] | 32 | int ntails; |
---|
[461541a] | 33 | |
---|
| 34 | char *head_string; |
---|
[ab63ece] | 35 | char **tail_strings; |
---|
[461541a] | 36 | |
---|
| 37 | abac_chunk_t cert; // the XML chunk |
---|
| 38 | }; |
---|
| 39 | |
---|
| 40 | char *abac_attribute_role_string(abac_attribute_t *attr); |
---|
[13b087a] | 41 | extern abac_id_t *abac_verifier_lookup_id(abac_list_t*, char *keyid); |
---|
[461541a] | 42 | static char *_validate_principal(char *keyid); |
---|
| 43 | |
---|
| 44 | /************************************************************/ |
---|
| 45 | abac_chunk_t abac_attribute_cert(abac_attribute_t *ptr) |
---|
| 46 | { |
---|
| 47 | assert(ptr); |
---|
| 48 | return ptr->cert; |
---|
| 49 | } |
---|
| 50 | |
---|
| 51 | abac_id_t *abac_attribute_issuer_id(abac_attribute_t *ptr) |
---|
| 52 | { |
---|
| 53 | assert(ptr); |
---|
| 54 | return ptr->issuer_id; |
---|
| 55 | } |
---|
| 56 | |
---|
| 57 | // validity is measured in seconds (as of 0.2.0) |
---|
| 58 | // Acme.customer |
---|
| 59 | int abac_attribute_create(abac_attribute_t **ret, abac_id_t *issuer_id, char *role, long validity) { |
---|
[ef68ac9] | 60 | libabac_init(); |
---|
[461541a] | 61 | if (!abac_id_has_privkey(issuer_id)) |
---|
| 62 | return ABAC_ATTRIBUTE_ISSUER_NOKEY; |
---|
| 63 | if (!abac_clean_name(role)) |
---|
| 64 | return ABAC_ATTRIBUTE_INVALID_ROLE; |
---|
| 65 | if (validity < 0) |
---|
| 66 | return ABAC_ATTRIBUTE_INVALID_VALIDITY; |
---|
| 67 | if (!abac_id_still_valid(issuer_id)) |
---|
| 68 | return ABAC_ATTRIBUTE_INVALID_ISSUER; |
---|
| 69 | |
---|
[7e3f5e2] | 70 | if(validity == 0) validity = (long)(60*60*24*(365)); |
---|
| 71 | |
---|
[461541a] | 72 | abac_attribute_t *attr = abac_xmalloc(sizeof(abac_attribute_t)); |
---|
| 73 | if(issuer_id) attr->issuer_id = abac_id_dup(issuer_id); |
---|
| 74 | else attr->issuer_id = NULL; |
---|
| 75 | attr->role = abac_xstrdup(role); |
---|
| 76 | attr->validity = validity; |
---|
| 77 | |
---|
| 78 | attr->head_string = NULL; |
---|
[4721618] | 79 | asprintf(&attr->head_string,"%s.%s",abac_id_keyid(issuer_id),role); |
---|
[ab63ece] | 80 | attr->ntails = 0; |
---|
| 81 | attr->tail_strings = NULL; |
---|
[461541a] | 82 | |
---|
| 83 | // NULL until baked |
---|
| 84 | attr->cert.ptr=NULL; |
---|
| 85 | attr->cert.len=0; |
---|
| 86 | |
---|
| 87 | *ret = attr; |
---|
| 88 | return ABAC_SUCCESS; |
---|
| 89 | } |
---|
| 90 | |
---|
| 91 | /** |
---|
| 92 | * Get the validity period.(xml module returns the diff from expire time - now() |
---|
| 93 | */ |
---|
| 94 | int abac_attribute_validity(abac_attribute_t *attr,struct tm *not_before,struct tm *not_after) { |
---|
| 95 | assert(attr); |
---|
| 96 | memset(not_before, 0, sizeof(struct tm)); |
---|
| 97 | memset(not_after, 0, sizeof(struct tm)); |
---|
| 98 | |
---|
| 99 | time_t now; |
---|
| 100 | time(&now); |
---|
| 101 | gmtime_r(&now, not_before); |
---|
[9ac7fb4] | 102 | char *xml=(char *)attr->cert.ptr; |
---|
[461541a] | 103 | long validity=get_validity_from_xml(xml); |
---|
| 104 | |
---|
| 105 | time_t etime = now + validity; |
---|
| 106 | gmtime_r(&etime, not_after); |
---|
| 107 | |
---|
[7e3f5e2] | 108 | if(debug) fprintf(stderr,"validity from the xml blob is %ld\n",validity); |
---|
[461541a] | 109 | if(validity == 0) |
---|
| 110 | return ABAC_FAILURE; |
---|
| 111 | return ABAC_SUCCESS; |
---|
| 112 | } |
---|
| 113 | |
---|
| 114 | int abac_attribute_still_valid(abac_attribute_t *attr) |
---|
| 115 | { |
---|
| 116 | assert(attr); |
---|
| 117 | assert(attr->cert.ptr); |
---|
[9ac7fb4] | 118 | long v=get_validity_from_xml((char *)attr->cert.ptr); |
---|
[461541a] | 119 | if (v > 0.0) |
---|
| 120 | return 1; |
---|
| 121 | else return 0; |
---|
| 122 | } |
---|
| 123 | |
---|
[ab63ece] | 124 | int abac_attribute_add_tail(abac_attribute_t *attr, char *string) { |
---|
| 125 | assert(attr); |
---|
| 126 | |
---|
| 127 | char **old_tail = attr->tail_strings; |
---|
| 128 | int newsize = (attr->ntails+1)*sizeof(char *); |
---|
| 129 | |
---|
| 130 | if ( !(attr->tail_strings = realloc(attr->tail_strings, newsize))) { |
---|
| 131 | attr->tail_strings = old_tail; |
---|
| 132 | return 0; |
---|
| 133 | } |
---|
| 134 | attr->tail_strings[attr->ntails++] = abac_xstrdup(string); |
---|
| 135 | return 1; |
---|
| 136 | } |
---|
| 137 | |
---|
| 138 | |
---|
[461541a] | 139 | void abac_attribute_set_head(abac_attribute_t *attr, char *string) |
---|
| 140 | { |
---|
| 141 | assert(attr); |
---|
| 142 | attr->head_string=string; |
---|
| 143 | } |
---|
| 144 | |
---|
| 145 | char *abac_attribute_get_head(abac_attribute_t *attr) |
---|
| 146 | { |
---|
| 147 | assert(attr); |
---|
| 148 | return attr->head_string; |
---|
| 149 | } |
---|
[ab63ece] | 150 | /* |
---|
[461541a] | 151 | void abac_attribute_set_tail(abac_attribute_t *attr, char *string) |
---|
| 152 | { |
---|
| 153 | assert(attr); |
---|
| 154 | attr->tail_string=string; |
---|
| 155 | } |
---|
| 156 | |
---|
| 157 | char *abac_attribute_get_tail(abac_attribute_t *attr) |
---|
| 158 | { |
---|
| 159 | assert(attr); |
---|
| 160 | return attr->tail_string; |
---|
| 161 | } |
---|
[ab63ece] | 162 | */ |
---|
[461541a] | 163 | |
---|
| 164 | /* A.b->C, return copy of a A */ |
---|
| 165 | char *abac_attribute_get_principal(abac_attribute_t *attr) |
---|
| 166 | { |
---|
| 167 | char *role_string=abac_attribute_role_string(attr); |
---|
| 168 | /* make an copy */ |
---|
| 169 | char *tmp=strdup(role_string); |
---|
| 170 | char *head_tail[2]; |
---|
[ab63ece] | 171 | int ret = 2; |
---|
[461541a] | 172 | abac_split(tmp, "<-", head_tail, &ret); |
---|
| 173 | if (ret != 2) goto err; |
---|
| 174 | abac_split(head_tail[0], ".", head_tail, &ret); |
---|
| 175 | if (ret != 2) goto err; |
---|
| 176 | char *prin=strdup(head_tail[0]); |
---|
| 177 | free(tmp); |
---|
| 178 | return prin; |
---|
| 179 | |
---|
| 180 | err: |
---|
| 181 | free(tmp); |
---|
| 182 | return NULL; |
---|
| 183 | } |
---|
| 184 | |
---|
| 185 | int abac_attribute_principal(abac_attribute_t *attr, char *keyid) { |
---|
| 186 | char *copy = _validate_principal(keyid); |
---|
| 187 | if (copy == NULL) |
---|
| 188 | return 0; |
---|
| 189 | |
---|
[ab63ece] | 190 | return abac_attribute_add_tail(attr,copy); |
---|
[461541a] | 191 | } |
---|
| 192 | |
---|
| 193 | int abac_attribute_role(abac_attribute_t *attr, char *keyid, char *role) { |
---|
| 194 | if (!abac_clean_name(role)) |
---|
| 195 | return 0; |
---|
| 196 | |
---|
| 197 | char *copy = _validate_principal(keyid); |
---|
[ab63ece] | 198 | char *newcopy=NULL; |
---|
[461541a] | 199 | if (copy == NULL) |
---|
| 200 | return 0; |
---|
| 201 | |
---|
[ab63ece] | 202 | asprintf(&newcopy,"%s.%s", copy,role); |
---|
[4e10a0f] | 203 | free(copy); |
---|
[ab63ece] | 204 | return abac_attribute_add_tail(attr, newcopy); |
---|
[461541a] | 205 | } |
---|
| 206 | |
---|
| 207 | int abac_attribute_linking_role(abac_attribute_t *attr, char *keyid, char *role, char *linked) { |
---|
| 208 | if (!abac_clean_name(role) || !abac_clean_name(linked)) |
---|
| 209 | return 0; |
---|
| 210 | |
---|
| 211 | char *copy = _validate_principal(keyid); |
---|
| 212 | if (copy == NULL) |
---|
| 213 | return 0; |
---|
| 214 | |
---|
[4e10a0f] | 215 | char *newcopy=NULL; |
---|
[ab63ece] | 216 | asprintf(&newcopy,"%s.%s.%s", copy,role,linked); |
---|
[4e10a0f] | 217 | free(copy); |
---|
[ab63ece] | 218 | return abac_attribute_add_tail(attr, newcopy); |
---|
[461541a] | 219 | } |
---|
| 220 | |
---|
| 221 | |
---|
| 222 | |
---|
| 223 | // 0 for fail to bake, 1 is baked okay |
---|
| 224 | int abac_attribute_bake(abac_attribute_t *attr) { |
---|
| 225 | assert(attr); |
---|
| 226 | assert(attr->head_string); |
---|
[ab63ece] | 227 | assert(attr->tail_strings); |
---|
[461541a] | 228 | |
---|
| 229 | abac_chunk_t id_chunk = { NULL, 0 }; |
---|
| 230 | int ret=abac_id_PEM(attr->issuer_id, &id_chunk); |
---|
| 231 | if(ret != ABAC_CERT_SUCCESS) |
---|
| 232 | return 0; |
---|
| 233 | |
---|
| 234 | char *role_string = abac_attribute_role_string(attr); |
---|
| 235 | |
---|
| 236 | /* Make an new GENI abac credential with the rt0 rule that expires secs from |
---|
| 237 | * now. cert is the PEM encoded X.509 of the issuer's certificate as a string. |
---|
| 238 | * certlen is the length of cert. Returns the XML. Caller is responsible for |
---|
| 239 | * freeing it. */ |
---|
[9ac7fb4] | 240 | char *attr_cert=my_make_credential(role_string, attr->validity, (char *)id_chunk.ptr, id_chunk.len); |
---|
[461541a] | 241 | |
---|
| 242 | if (attr_cert == NULL) |
---|
| 243 | return 0; |
---|
| 244 | |
---|
| 245 | attr->cert.ptr = (unsigned char *)attr_cert; |
---|
| 246 | attr->cert.len = strlen(attr_cert); |
---|
| 247 | |
---|
| 248 | free(role_string); |
---|
| 249 | return 1; |
---|
| 250 | } |
---|
| 251 | |
---|
| 252 | // make an explicit copy |
---|
[4721618] | 253 | abac_chunk_t abac_attribute_cert_chunk(abac_attribute_t *attr) { |
---|
| 254 | abac_chunk_t chunk= {NULL,0}; |
---|
[461541a] | 255 | |
---|
| 256 | if (attr->cert.ptr == NULL) |
---|
[4721618] | 257 | return chunk; |
---|
[461541a] | 258 | |
---|
| 259 | /* return the xml chunk */ |
---|
[4721618] | 260 | chunk.ptr= (unsigned char *)abac_xstrdup((char *)attr->cert.ptr); |
---|
| 261 | chunk.len=attr->cert.len; |
---|
| 262 | return chunk; |
---|
[461541a] | 263 | } |
---|
| 264 | |
---|
| 265 | int abac_attribute_baked(abac_attribute_t *attr) { |
---|
| 266 | return (attr->cert.ptr != NULL); |
---|
| 267 | } |
---|
| 268 | |
---|
| 269 | |
---|
[bec30b5] | 270 | static abac_attribute_t *_load_attr(abac_list_t *id_certs,char *rstring, char *xml) |
---|
[461541a] | 271 | { |
---|
[02036f4] | 272 | /* make a copy of rle_string */ |
---|
| 273 | char *role_string=abac_xstrdup(rstring); |
---|
[461541a] | 274 | |
---|
| 275 | if(debug) fprintf(stderr,"loading -> %s \n", role_string); |
---|
| 276 | |
---|
| 277 | char *head_tail[2]; |
---|
[ab63ece] | 278 | char *role_rest[2]; |
---|
| 279 | int ret = 2; |
---|
[461541a] | 280 | abac_split(role_string, "<-", head_tail, &ret); |
---|
| 281 | if (ret != 2) return NULL; |
---|
| 282 | |
---|
| 283 | char *keyid=get_keyid_from_xml(xml); |
---|
[bec30b5] | 284 | abac_id_t *issuer_id=abac_verifier_lookup_id(id_certs,keyid); |
---|
[461541a] | 285 | |
---|
| 286 | long validity=get_validity_from_xml(xml); |
---|
| 287 | |
---|
| 288 | abac_attribute_t *attr = abac_xmalloc(sizeof(abac_attribute_t)); |
---|
| 289 | if(issuer_id) |
---|
| 290 | attr->issuer_id = abac_id_dup(issuer_id); |
---|
| 291 | else attr->issuer_id=NULL; |
---|
| 292 | attr->validity = validity; |
---|
| 293 | |
---|
| 294 | attr->head_string = abac_xstrdup(head_tail[0]); |
---|
[ab63ece] | 295 | do { |
---|
| 296 | ret = 2; |
---|
| 297 | abac_split(head_tail[1], " & ", role_rest, &ret); |
---|
| 298 | abac_attribute_add_tail(attr, abac_xstrdup(role_rest[0])); |
---|
| 299 | head_tail[1] =role_rest[1]; |
---|
| 300 | } while (ret == 2); |
---|
| 301 | |
---|
[461541a] | 302 | char *tmp=strstr(attr->head_string,"."); |
---|
| 303 | attr->role =abac_xstrdup(tmp+1); |
---|
| 304 | |
---|
[9e063cb] | 305 | attr->cert.ptr=(unsigned char *)abac_xstrdup(xml); |
---|
[461541a] | 306 | attr->cert.len=strlen(xml); |
---|
| 307 | |
---|
| 308 | return attr; |
---|
| 309 | } |
---|
| 310 | |
---|
[bec30b5] | 311 | abac_list_t *abac_attribute_certs_from_file(abac_list_t *id_certs,char *filename) |
---|
[461541a] | 312 | { |
---|
[ef68ac9] | 313 | libabac_init(); |
---|
[461541a] | 314 | abac_list_t *alist=abac_list_new(); |
---|
| 315 | char *xml=NULL; |
---|
| 316 | char *rt0=NULL; |
---|
| 317 | |
---|
[bec30b5] | 318 | char **rt0s=my_read_credential((void *)id_certs,filename, &xml); |
---|
[4721618] | 319 | if(rt0s == NULL) return alist; |
---|
| 320 | if(xml == NULL || strlen(xml)==0) return alist; |
---|
[461541a] | 321 | |
---|
| 322 | abac_attribute_t *attr; |
---|
| 323 | |
---|
| 324 | int i=0; |
---|
| 325 | do { |
---|
| 326 | rt0 = rt0s[i]; |
---|
| 327 | if(rt0 == NULL) break; |
---|
[bec30b5] | 328 | attr=_load_attr(id_certs,rt0, xml); |
---|
[461541a] | 329 | if(attr) |
---|
| 330 | abac_list_add(alist, attr); |
---|
| 331 | free(rt0); |
---|
| 332 | i++; |
---|
| 333 | } while (rt0s[i] !=NULL); |
---|
| 334 | |
---|
| 335 | free(rt0s); |
---|
| 336 | free(xml); |
---|
| 337 | |
---|
| 338 | return alist; |
---|
| 339 | } |
---|
| 340 | |
---|
[bec30b5] | 341 | abac_list_t *abac_attribute_certs_from_chunk(abac_list_t *id_certs,abac_chunk_t chunk) { |
---|
[ef68ac9] | 342 | libabac_init(); |
---|
[461541a] | 343 | |
---|
| 344 | abac_list_t *alist=abac_list_new(); |
---|
| 345 | char *xml=(char *)chunk.ptr; |
---|
[4721618] | 346 | if(chunk.len==0) return alist; |
---|
| 347 | |
---|
[bec30b5] | 348 | char **rt0s=get_rt0_from_xml((void *) id_certs,xml); |
---|
[461541a] | 349 | char *rt0=NULL; |
---|
[4721618] | 350 | if(rt0s==NULL) return alist; |
---|
[461541a] | 351 | |
---|
| 352 | abac_attribute_t *attr; |
---|
| 353 | int i=0; |
---|
| 354 | do { |
---|
| 355 | rt0 = rt0s[i]; |
---|
| 356 | if(rt0 == NULL) break; |
---|
[bec30b5] | 357 | attr=_load_attr(id_certs,rt0, xml); |
---|
[461541a] | 358 | if(attr) |
---|
| 359 | abac_list_add(alist, attr); |
---|
| 360 | free(rt0); |
---|
| 361 | i++; |
---|
| 362 | } while (rt0s[i] !=NULL); |
---|
| 363 | |
---|
| 364 | free(rt0s); |
---|
| 365 | return alist; |
---|
| 366 | } |
---|
| 367 | |
---|
[4721618] | 368 | // returns ABAC_FAILURE if the cert hasn't been baked |
---|
[461541a] | 369 | int abac_attribute_write(abac_attribute_t *attr, FILE *out) { |
---|
| 370 | assert(attr != NULL); |
---|
| 371 | |
---|
| 372 | if (attr->cert.ptr == NULL) |
---|
[4721618] | 373 | return ABAC_FAILURE; |
---|
[461541a] | 374 | |
---|
| 375 | // write to file |
---|
| 376 | fwrite(attr->cert.ptr, attr->cert.len, 1, out); |
---|
| 377 | |
---|
[4721618] | 378 | return ABAC_SUCCESS; |
---|
[461541a] | 379 | } |
---|
| 380 | |
---|
[4721618] | 381 | // returns ABAC_FAILURE if the cert hasn't been baked |
---|
| 382 | int abac_attribute_write_file(abac_attribute_t *attr, const char *fname) { |
---|
| 383 | if (attr->cert.ptr == NULL) |
---|
| 384 | return ABAC_FAILURE; |
---|
| 385 | |
---|
| 386 | FILE *fp=fopen(fname,"w+"); |
---|
| 387 | if(fp) { |
---|
| 388 | // write to file |
---|
| 389 | fwrite(attr->cert.ptr, attr->cert.len, 1, fp); |
---|
| 390 | } else return ABAC_FAILURE; |
---|
| 391 | fclose(fp); |
---|
| 392 | |
---|
| 393 | return ABAC_SUCCESS; |
---|
| 394 | } |
---|
| 395 | |
---|
| 396 | |
---|
[461541a] | 397 | void abac_attribute_free(abac_attribute_t *attr) { |
---|
| 398 | |
---|
| 399 | if(debug) fprintf(stderr,"calling abac_attribute_free on %s\n", attr->head_string); |
---|
[ab63ece] | 400 | int i = 0; |
---|
[461541a] | 401 | |
---|
| 402 | if (attr == NULL) |
---|
| 403 | return; |
---|
| 404 | |
---|
| 405 | if(attr->issuer_id) abac_id_free(attr->issuer_id); |
---|
| 406 | |
---|
| 407 | free(attr->role); |
---|
| 408 | free(attr->head_string); |
---|
[ab63ece] | 409 | for (i=0; i < attr->ntails; i++) |
---|
| 410 | free(attr->tail_strings[i]); |
---|
| 411 | free(attr->tail_strings); |
---|
[461541a] | 412 | |
---|
| 413 | /* XXX this can not be free as if it is a char string |
---|
| 414 | free(attr->cert.ptr); |
---|
| 415 | */ |
---|
| 416 | |
---|
| 417 | free(attr); |
---|
| 418 | } |
---|
| 419 | |
---|
| 420 | // |
---|
| 421 | // Helper functions below |
---|
| 422 | // |
---|
| 423 | |
---|
| 424 | // validate a princpal's name |
---|
| 425 | // makes sure it's a valid SHA1 identifier |
---|
| 426 | // return values: |
---|
| 427 | // success: malloc'd copy with all hex digits lowercase |
---|
| 428 | // fail: NULL |
---|
| 429 | static char *_validate_principal(char *keyid) { |
---|
| 430 | int i; |
---|
| 431 | char *copy = NULL; |
---|
| 432 | |
---|
| 433 | if (strlen(keyid) != SHA1_LENGTH) |
---|
| 434 | return NULL; |
---|
| 435 | |
---|
| 436 | copy = abac_xstrdup(keyid); |
---|
| 437 | for (i = 0; i < SHA1_LENGTH; ++i) { |
---|
| 438 | copy[i] = tolower(copy[i]); |
---|
| 439 | if (!isxdigit(copy[i])) |
---|
| 440 | goto error; |
---|
| 441 | } |
---|
| 442 | |
---|
| 443 | return copy; |
---|
| 444 | |
---|
| 445 | error: |
---|
| 446 | free(copy); |
---|
| 447 | return NULL; |
---|
| 448 | } |
---|
| 449 | |
---|
[ab63ece] | 450 | static int abac_attribute_role_string_size(abac_attribute_t *attr) { |
---|
| 451 | int sz = 3; /* Start with the end of string character and <-*/ |
---|
| 452 | int i; /* Scratch */ |
---|
| 453 | |
---|
| 454 | if ( !attr) return sz; |
---|
| 455 | if ( attr->head_string) |
---|
| 456 | sz += strlen(attr->head_string); |
---|
| 457 | for (i = 0; i < attr->ntails; i++) |
---|
| 458 | if ( attr->tail_strings[i]) |
---|
| 459 | sz += strlen(attr->tail_strings[i]); |
---|
| 460 | /* " & " between each pair of tails */ |
---|
| 461 | sz += 3 * (attr->ntails-1); |
---|
| 462 | return sz; |
---|
| 463 | } |
---|
| 464 | |
---|
[461541a] | 465 | // combine up the attribute's rule string, explicit copy |
---|
| 466 | char *abac_attribute_role_string(abac_attribute_t *attr) { |
---|
| 467 | assert(attr); |
---|
| 468 | |
---|
[ab63ece] | 469 | int sz = abac_attribute_role_string_size(attr); |
---|
| 470 | char *role_string=abac_xmalloc(sz); |
---|
| 471 | int i; |
---|
| 472 | |
---|
| 473 | if ( !role_string) return NULL; |
---|
[461541a] | 474 | |
---|
[ab63ece] | 475 | sz -= snprintf(role_string, sz, "%s<-", attr->head_string); |
---|
| 476 | for ( i = 0 ; i < attr->ntails; i++ ) { |
---|
| 477 | if ( i > 0 ) { |
---|
| 478 | strncat(role_string, " & ", 3); |
---|
| 479 | sz -= 3; |
---|
| 480 | } |
---|
| 481 | strncat(role_string,attr->tail_strings[i], sz); |
---|
[461541a] | 482 | |
---|
[ab63ece] | 483 | sz -= strlen(attr->tail_strings[i]); |
---|
| 484 | if (sz < 0 ) return NULL; |
---|
| 485 | } |
---|
| 486 | return role_string; |
---|
| 487 | } |
---|