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 /* Returns TRUE (1) if the the string (str) matchs the wildcard string (wc_str), FALSE (0) if not.
81 int tr_prefix_wildcard_match (const char *str, const char *wc_str) {
82 const char *wc_post = wc_str;
86 if ((!str) || (!wc_str))
90 if (0 == (wc_len = strlen(wc_str)))
93 /* TBD -- skip leading white space? */
94 if ('*' == wc_str[0]) {
95 wc_post = &(wc_str[1]);
97 }else if (len != wc_len)
104 if (0 == strcmp(&(str[len-wc_len]), wc_post)) {
111 TR_CONSTRAINT_SET *tr_constraint_set_from_fline (TR_FLINE *fline)
118 if (fline->realm_cons)
119 tr_constraint_add_to_set((TR_CONSTRAINT_SET **)&cset, fline->realm_cons);
120 if (fline->domain_cons)
121 tr_constraint_add_to_set((TR_CONSTRAINT_SET **)&cset, fline->domain_cons);
123 return (TR_CONSTRAINT_SET *) cset;
126 /* A constraint set is represented in json as an array of constraint
127 * objects. So, a constraint set (cset) that consists of one realm
128 * constraint and one domain constraint might look like:
130 * {cset: [{domain: [a.com, b.co.uk]},
131 * {realm: [c.net, d.org]}]}
134 void tr_constraint_add_to_set (TR_CONSTRAINT_SET **cset, TR_CONSTRAINT *cons)
136 json_t *jcons = NULL;
137 json_t *jmatches = NULL;
140 if ((!cset) || (!cons))
143 /* If we don't already have a json object, create one */
145 *cset = (TR_CONSTRAINT_SET *) json_array();
147 /* Create a json object representing cons */
148 jmatches = json_array();
149 jcons = json_object();
151 for (i = 0; ((i < TR_MAX_CONST_MATCHES) && (NULL != cons->matches[i])); i++) {
152 json_array_append_new(jmatches, json_string(cons->matches[i]->buf));
155 json_object_set_new(jcons, cons->type->buf, jmatches);
157 /* Add the created object to the cset object */
158 json_array_append_new((json_t *) *cset, jcons);
161 int tr_constraint_set_validate(TR_CONSTRAINT_SET *cset)
163 json_t *json = (json_t *) cset;
166 if (!json_is_array(json)){
167 tr_debug("Constraint_set is not an array");
170 json_array_foreach(json, i, set_member) {
173 if (!json_is_object(set_member)) {
174 tr_debug("Constraint member at %zu is not an object\n", i);
177 json_object_foreach( set_member, key, value) {
180 if (!json_is_array(value)) {
181 tr_debug("Constraint type %s at index %zu in constraint set is not an array\n", key,
185 json_array_foreach(value, inner_index, inner_value) {
186 if (!json_is_string(inner_value)) {
187 tr_debug("Constraint type %s at index %zu in constraint set has non-string element %zu\n",
188 key, i, inner_index);
198 TR_CONSTRAINT_SET *tr_constraint_set_filter( TID_REQ *request,
199 TR_CONSTRAINT_SET *orig,
200 const char *constraint_type)
202 json_t *orig_cset = (json_t*) orig;
203 json_t *new_cs = NULL;
206 if (!tr_constraint_set_validate( (TR_CONSTRAINT_SET *) orig_cset)) {
207 tr_debug ("tr_constraint_set_filter: not a valid constraint set\n");
210 assert (new_cs = json_array());
211 json_array_foreach(orig_cset, index, set_member) {
212 if (json_object_get( set_member, constraint_type))
213 json_array_append(new_cs, set_member);
215 return (TR_CONSTRAINT_SET *) new_cs;
219 * Within a given constraint object merge any overlapping domain or
220 * realm constraints. For example ['*','*.net'] can be simplified to
223 static void merge_constraints(json_t *constraint, const char *key)
225 json_t *value_1, *value_2, *constraint_array;
226 size_t index_1, index_2;
228 * Go through the loop pairwise linear, removing elements where one
229 * element is a subset of the other. Always shrik the array from
230 * the end so that index_1 never becomes invalid (swapping if
233 constraint_array = json_object_get(constraint, key);
234 if (NULL == constraint_array)
236 json_array_foreach( constraint_array, index_1, value_1)
237 json_array_foreach( constraint_array, index_2, value_2) {
238 if (index_2 <= index_1)
240 if ( tr_prefix_wildcard_match( json_string_value(value_2),
241 json_string_value(value_1))) {
242 json_array_remove(constraint_array, index_2);
244 }else if (tr_prefix_wildcard_match( json_string_value(value_1),
245 json_string_value(value_2))) {
246 json_array_set(constraint_array, index_1, value_2);
247 json_array_remove(constraint_array, index_2);
254 * Returns an array of constraint strings that is the intersection of
255 * all constraints in the constraint_set of type #type
257 static json_t *constraint_intersect_internal( TR_CONSTRAINT_SET *constraints,
258 const char *constraint_type)
260 json_t *constraint, *result = NULL;
262 json_array_foreach( (json_t *) constraints, i, constraint) {
263 merge_constraints( constraint, constraint_type);
264 if (NULL == result) {
265 result = json_object_get(constraint, constraint_type);
267 result = json_copy(result);
269 json_t *intersect, *value_1, *value_2;
270 size_t index_1, index_2;
271 intersect = json_object_get(constraint, constraint_type);
272 /*If an element of the constraint set doesn't have a particular
273 * constraint type, we ignore that element of the constraint set.
274 * However, if no element of the constraint set has a particular
275 * constraint type we return empty (no access) rather than universal
280 json_array_foreach(result, index_1, value_1) {
281 json_array_foreach(intersect, index_2, value_2) {
282 if (tr_prefix_wildcard_match( json_string_value(value_1),
283 json_string_value(value_2)))
284 goto result_acceptable;
285 else if (tr_prefix_wildcard_match(json_string_value( value_2),
286 json_string_value(value_1))) {
287 json_array_set(result, index_1, value_2);
288 goto result_acceptable;
291 json_array_remove(result, index_1);
295 result_acceptable: continue;
303 * Return the intersection of domain and realm constraints.
304 * Return is live until #request is freed.
306 TR_CONSTRAINT_SET *tr_constraint_set_intersect( TID_REQ *request,
307 TR_CONSTRAINT_SET *input)
309 json_t *domain=NULL, *realm=NULL;
310 json_t *result = NULL, *result_array = NULL;
311 if (tr_constraint_set_validate(input)) {
312 domain = constraint_intersect_internal(input, "domain");
313 realm = constraint_intersect_internal(input, "realm");
315 assert(result = json_object());
317 json_object_set_new(result, "domain", domain);
319 json_object_set_new(result, "realm", realm);
320 assert(result_array = json_array());
321 json_array_append_new(result_array, result);
322 tid_req_cleanup_json( request, result_array);
323 return (TR_CONSTRAINT_SET *) result_array;
327 int tr_constraint_set_get_match_strings(
329 TR_CONSTRAINT_SET *constraints,
330 const char *constraint_type,
331 tr_const_string **output,
334 json_t *cset = (json_t *) constraints;
335 json_t *member, *matches, *value;;
336 size_t index, array_size;
337 assert (output && output_len);
340 if (json_array_size(cset) != 1) {
341 tr_debug("Constraint set for get_match_strings has more than one member\n");
344 member = json_array_get(cset, 0);
345 matches = json_object_get(member, constraint_type);
348 array_size = json_array_size(matches);
351 *output = talloc_array_ptrtype(request, *output, array_size);
352 json_array_foreach( matches, index, value)
353 (*output)[index] = json_string_value(value);
354 *output_len = array_size;