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 | /********************************************************************/ |
---|
32 | char *get_cred_encoding(abac_attribute_t *ptr) |
---|
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 | |
---|
126 | char *cred_encoding = get_cred_encoding(ptr); |
---|
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 | ); |
---|
144 | |
---|
145 | if (attr_cert == NULL) |
---|
146 | return 0; |
---|
147 | |
---|
148 | ptr->cert = attr_cert; |
---|
149 | // cert and issuer can be the same, in which case it is the self signing |
---|
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); |
---|
159 | chunk_t encoding = chunk_empty; |
---|
160 | int rc=ptr->cert->get_encoding(ptr->cert,CERT_ASN1_DER,&encoding); |
---|
161 | abac_chunk_t ret = { encoding.ptr, encoding.len }; |
---|
162 | return ret; |
---|
163 | } |
---|
164 | |
---|
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 | |
---|
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 |
---|
188 | int abac_attribute_write_cert(abac_attribute_t *ptr, FILE *out) { |
---|
189 | assert(ptr != NULL); |
---|
190 | |
---|
191 | if (ptr->cert == NULL) |
---|
192 | return 0; |
---|
193 | |
---|
194 | // write to file |
---|
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; |
---|
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 | |
---|
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) |
---|
239 | errx(1, "attribute string, head and tail can not be NULL"); |
---|
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) |
---|
249 | errx(1, "attribute typed string, head and tail can not be NULL"); |
---|
250 | char *tmp=NULL; |
---|
251 | asprintf(&tmp,"%s<-%s",head,tail); |
---|
252 | return tmp; |
---|
253 | } |
---|
254 | |
---|
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 | |
---|
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 | |
---|
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 | } |
---|