2 * Copyright (c) 2012-2014, JANET(UK)
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35 #include "jansson_iterators.h"
39 #include <tr_filter.h>
42 #include <trust_router/tr_constraint.h>
43 #include <tid_internal.h>
46 static int tr_constraint_destructor(void *obj)
48 TR_CONSTRAINT *cons=talloc_get_type_abort(obj, TR_CONSTRAINT);
52 tr_free_name(cons->type);
53 for (ii=0; ii<TR_MAX_CONST_MATCHES; ii++) {
54 if (cons->matches[ii]!=NULL)
55 tr_free_name(cons->matches[ii]);
60 TR_CONSTRAINT *tr_constraint_new(TALLOC_CTX *mem_ctx)
62 TR_CONSTRAINT *cons=talloc(mem_ctx, TR_CONSTRAINT);
67 for (ii=0; ii<TR_MAX_CONST_MATCHES; ii++)
68 cons->matches[ii]=NULL;
69 talloc_set_destructor((void *)cons, tr_constraint_destructor);
74 void tr_constraint_free(TR_CONSTRAINT *cons)
79 TR_CONSTRAINT *tr_constraint_dup(TALLOC_CTX *mem_ctx, TR_CONSTRAINT *cons)
81 TALLOC_CTX *tmp_ctx=NULL;
82 TR_CONSTRAINT *new=NULL;
88 tmp_ctx=talloc_new(NULL);
89 new=tr_constraint_new(tmp_ctx);
92 new->type=tr_dup_name(cons->type);
93 for (ii=0; ii<TR_MAX_CONST_MATCHES; ii++)
94 new->matches[ii]=tr_dup_name(cons->matches[ii]);
95 talloc_steal(mem_ctx, new);
102 /* Returns TRUE (1) if the the string (str) matchs the wildcard string (wc_str), FALSE (0) if not.
104 int tr_prefix_wildcard_match (const char *str, const char *wc_str) {
105 const char *wc_post = wc_str;
109 if ((!str) || (!wc_str))
113 if (0 == (wc_len = strlen(wc_str)))
116 /* TBD -- skip leading white space? */
117 if ('*' == wc_str[0]) {
118 wc_post = &(wc_str[1]);
120 }else if (len != wc_len)
127 if (0 == strcmp(&(str[len-wc_len]), wc_post)) {
134 TR_CONSTRAINT_SET *tr_constraint_set_from_fline (TR_FLINE *fline)
141 if (fline->realm_cons)
142 tr_constraint_add_to_set((TR_CONSTRAINT_SET **)&cset, fline->realm_cons);
143 if (fline->domain_cons)
144 tr_constraint_add_to_set((TR_CONSTRAINT_SET **)&cset, fline->domain_cons);
146 return (TR_CONSTRAINT_SET *) cset;
149 /* A constraint set is represented in json as an array of constraint
150 * objects. So, a constraint set (cset) that consists of one realm
151 * constraint and one domain constraint might look like:
153 * {cset: [{domain: [a.com, b.co.uk]},
154 * {realm: [c.net, d.org]}]}
157 void tr_constraint_add_to_set (TR_CONSTRAINT_SET **cset, TR_CONSTRAINT *cons)
159 json_t *jcons = NULL;
160 json_t *jmatches = NULL;
163 if ((!cset) || (!cons))
166 /* If we don't already have a json object, create one */
168 *cset = (TR_CONSTRAINT_SET *) json_array();
170 /* Create a json object representing cons */
171 jmatches = json_array();
172 jcons = json_object();
174 for (i = 0; ((i < TR_MAX_CONST_MATCHES) && (NULL != cons->matches[i])); i++) {
175 json_array_append_new(jmatches, json_string(cons->matches[i]->buf));
178 json_object_set_new(jcons, cons->type->buf, jmatches);
180 /* Add the created object to the cset object */
181 json_array_append_new((json_t *) *cset, jcons);
184 int tr_constraint_set_validate(TR_CONSTRAINT_SET *cset)
186 json_t *json = (json_t *) cset;
189 if (!json_is_array(json)){
190 tr_debug("Constraint_set is not an array");
193 json_array_foreach(json, i, set_member) {
196 if (!json_is_object(set_member)) {
197 tr_debug("Constraint member at %zu is not an object\n", i);
200 json_object_foreach( set_member, key, value) {
203 if (!json_is_array(value)) {
204 tr_debug("Constraint type %s at index %zu in constraint set is not an array\n", key,
208 json_array_foreach(value, inner_index, inner_value) {
209 if (!json_is_string(inner_value)) {
210 tr_debug("Constraint type %s at index %zu in constraint set has non-string element %zu\n",
211 key, i, inner_index);
221 TR_CONSTRAINT_SET *tr_constraint_set_filter( TID_REQ *request,
222 TR_CONSTRAINT_SET *orig,
223 const char *constraint_type)
225 json_t *orig_cset = (json_t*) orig;
226 json_t *new_cs = NULL;
229 if (!tr_constraint_set_validate( (TR_CONSTRAINT_SET *) orig_cset)) {
230 tr_debug ("tr_constraint_set_filter: not a valid constraint set\n");
233 assert (new_cs = json_array());
234 json_array_foreach(orig_cset, index, set_member) {
235 if (json_object_get( set_member, constraint_type))
236 json_array_append(new_cs, set_member);
238 return (TR_CONSTRAINT_SET *) new_cs;
242 * Within a given constraint object merge any overlapping domain or
243 * realm constraints. For example ['*','*.net'] can be simplified to
246 static void merge_constraints(json_t *constraint, const char *key)
248 json_t *value_1, *value_2, *constraint_array;
249 size_t index_1, index_2;
251 * Go through the loop pairwise linear, removing elements where one
252 * element is a subset of the other. Always shrik the array from
253 * the end so that index_1 never becomes invalid (swapping if
256 constraint_array = json_object_get(constraint, key);
257 if (NULL == constraint_array)
259 json_array_foreach( constraint_array, index_1, value_1)
260 json_array_foreach( constraint_array, index_2, value_2) {
261 if (index_2 <= index_1)
263 if ( tr_prefix_wildcard_match( json_string_value(value_2),
264 json_string_value(value_1))) {
265 json_array_remove(constraint_array, index_2);
267 }else if (tr_prefix_wildcard_match( json_string_value(value_1),
268 json_string_value(value_2))) {
269 json_array_set(constraint_array, index_1, value_2);
270 json_array_remove(constraint_array, index_2);
277 * Returns an array of constraint strings that is the intersection of
278 * all constraints in the constraint_set of type #type
280 static json_t *constraint_intersect_internal( TR_CONSTRAINT_SET *constraints,
281 const char *constraint_type)
283 json_t *constraint, *result = NULL;
285 json_array_foreach( (json_t *) constraints, i, constraint) {
286 merge_constraints( constraint, constraint_type);
287 if (NULL == result) {
288 result = json_object_get(constraint, constraint_type);
290 result = json_copy(result);
292 json_t *intersect, *value_1, *value_2;
293 size_t index_1, index_2;
294 intersect = json_object_get(constraint, constraint_type);
295 /*If an element of the constraint set doesn't have a particular
296 * constraint type, we ignore that element of the constraint set.
297 * However, if no element of the constraint set has a particular
298 * constraint type we return empty (no access) rather than universal
303 json_array_foreach(result, index_1, value_1) {
304 json_array_foreach(intersect, index_2, value_2) {
305 if (tr_prefix_wildcard_match( json_string_value(value_1),
306 json_string_value(value_2)))
307 goto result_acceptable;
308 else if (tr_prefix_wildcard_match(json_string_value( value_2),
309 json_string_value(value_1))) {
310 json_array_set(result, index_1, value_2);
311 goto result_acceptable;
314 json_array_remove(result, index_1);
318 result_acceptable: continue;
326 * Return the intersection of domain and realm constraints.
327 * Return is live until #request is freed.
329 TR_CONSTRAINT_SET *tr_constraint_set_intersect( TID_REQ *request,
330 TR_CONSTRAINT_SET *input)
332 json_t *domain=NULL, *realm=NULL;
333 json_t *result = NULL, *result_array = NULL;
334 if (tr_constraint_set_validate(input)) {
335 domain = constraint_intersect_internal(input, "domain");
336 realm = constraint_intersect_internal(input, "realm");
338 assert(result = json_object());
340 json_object_set_new(result, "domain", domain);
342 json_object_set_new(result, "realm", realm);
343 assert(result_array = json_array());
344 json_array_append_new(result_array, result);
345 tid_req_cleanup_json( request, result_array);
346 return (TR_CONSTRAINT_SET *) result_array;
350 int tr_constraint_set_get_match_strings(
352 TR_CONSTRAINT_SET *constraints,
353 const char *constraint_type,
354 tr_const_string **output,
357 json_t *cset = (json_t *) constraints;
358 json_t *member, *matches, *value;;
359 size_t index, array_size;
360 assert (output && output_len);
363 if (json_array_size(cset) != 1) {
364 tr_debug("Constraint set for get_match_strings has more than one member\n");
367 member = json_array_get(cset, 0);
368 matches = json_object_get(member, constraint_type);
371 array_size = json_array_size(matches);
374 *output = talloc_array_ptrtype(request, *output, array_size);
375 json_array_foreach( matches, index, value)
376 (*output)[index] = json_string_value(value);
377 *output_len = array_size;