source: libabac/abac.c @ 91a6b20

abac0-leak
Last change on this file since 91a6b20 was f2622ee, checked in by Mei-Hui Su <mei@…>, 6 years ago

1) ran with valgrind and did some leak patching

  • Property mode set to 100644
File size: 11.3 KB
Line 
1/* abac.c */
2
3#include <assert.h>
4#include <err.h>
5#include <sys/types.h>
6#include <sys/stat.h>
7#include <unistd.h>
8#include <dirent.h>
9
10#include "abac.h"
11#include "abac_list.h"
12#include "abac_graph.h"
13#include "abac_util.h"
14#include "abac_verifier.h"
15
16int debug=0;
17abac_id_cert_t **abac_context_principals(abac_context_t *ctx);
18void abac_context_id_credentials_free(abac_id_cert_t **id_credentials);
19
20struct _abac_context_t {
21/* list of principal id credentials, abac_id_cert_t */
22    abac_list_t *id_certs;
23    abac_graph_t *graph;
24    abac_keyid_map_t *keymap;
25};
26
27/**
28 * Init the library.
29 */
30void libabac_init(void) {
31    void libabac_deinit(void);
32    static int has_been_init = 0;
33
34    // called every time a context is created, so only do it once
35    if (!has_been_init) {
36        abac_verifier_init();
37        atexit(libabac_deinit);
38        has_been_init = 1;
39    }
40}
41
42/**
43 * Deinit the library.
44 */
45void libabac_deinit(void) {
46    abac_verifier_deinit();
47}
48
49/**
50 * Create a new abac context.
51 */
52abac_context_t *abac_context_new(void) {
53    libabac_init();
54
55    abac_context_t *ctx = abac_xmalloc(sizeof(abac_context_t));
56    ctx->graph = abac_graph_new();
57    ctx->id_certs=abac_list_new();
58    ctx->keymap = abac_keyid_map_new();
59    return ctx;
60}
61
62/**
63 * Deep copy an abac context.
64 */
65abac_context_t *abac_context_dup(abac_context_t *ctx) {
66    assert(ctx != NULL);
67   
68    abac_context_t *dup = abac_xmalloc(sizeof(abac_context_t));
69    dup->graph = abac_graph_dup(ctx->graph);
70    dup->id_certs=abac_list_new();
71
72    abac_id_cert_t *id_cert;
73    abac_list_foreach(ctx->id_certs, id_cert,
74        abac_list_add(dup->id_certs, abac_id_cert_dup(id_cert));
75    );
76
77    dup->keymap = abac_keyid_map_clone(ctx->keymap);
78    return dup;
79}
80
81/**
82 * Free an abac context.
83 */
84void abac_context_free(abac_context_t *ctx) {
85    assert(ctx != NULL);
86
87    abac_graph_free(ctx->graph);
88
89    abac_id_cert_t *id_cert;
90    abac_list_foreach(ctx->id_certs, id_cert,
91        abac_id_cert_free(id_cert);
92    );
93    abac_list_free(ctx->id_certs);
94    abac_keyid_map_free(ctx->keymap);
95    free(ctx);
96}
97
98/**
99 * Load an ID cert from a file.
100 */
101int abac_context_load_id_file(abac_context_t *ctx, char *filename) {
102    assert(ctx != NULL); assert(filename != NULL);
103    return abac_verifier_load_id_file(ctx->id_certs,filename, ctx->keymap);
104}
105
106/**
107 * Load an ID cert from a chunk.
108 */
109int abac_context_load_id_chunk(abac_context_t *ctx, abac_chunk_t cert_chunk) {
110    assert(ctx != NULL);
111    return abac_verifier_load_id_chunk(ctx->id_certs,cert_chunk, ctx->keymap);
112}
113
114/**
115 * Load an ID cert from a id.
116 */
117/*
118int abac_context_load_id_chunk(abac_context_t *ctx, abac_id_t *id) {
119    assert(ctx != NULL);
120    return abac_verifier_load_id_id(ctx->id_certs,id, ctx->keymap);
121}
122*/
123
124
125/**
126 * Load an attribute cert from a file.
127 */
128int abac_context_load_attribute_file(abac_context_t *ctx, char *filename) {
129    int ret, add_ret;
130    abac_list_t *cred_list=abac_list_new(); // could be more than 1
131    abac_credential_t *cred;
132
133    assert(ctx != NULL); assert(filename != NULL);
134
135    ret = abac_verifier_load_attribute_cert_file(ctx->id_certs, filename, cred_list, ctx->keymap);
136
137    if (ret == ABAC_CERT_SUCCESS) {
138        int size = abac_list_size(cred_list);
139        if(size) {
140            abac_list_foreach(cred_list, cred,
141                add_ret = abac_graph_add_credential(ctx->graph, cred);
142                assert(add_ret != ABAC_GRAPH_CRED_INVALID);
143                abac_credential_free(cred);
144            );
145            abac_list_free(cred_list);
146        }
147    }
148    return ret;
149}
150
151/**
152 * Load an attribute cert from a chunk.
153 */
154int abac_context_load_attribute_chunk(abac_context_t *ctx, abac_chunk_t cert_chunk) {
155    int ret, add_ret;
156    abac_list_t  *cred_list=abac_list_new(); // could be more than 1
157    abac_credential_t *cred;
158
159    assert(ctx != NULL);
160
161    ret = abac_verifier_load_attribute_cert_chunk(ctx->id_certs, cert_chunk, cred_list, ctx->keymap);
162    if (ret == ABAC_CERT_SUCCESS) {
163        int size = abac_list_size(cred_list);
164        if(size) {
165            abac_list_foreach(cred_list, cred,
166                add_ret = abac_graph_add_credential(ctx->graph, cred);
167                assert(add_ret != ABAC_GRAPH_CRED_INVALID);
168                abac_credential_free(cred);
169            );
170            abac_list_free(cred_list);
171        }
172    }
173
174    return ret;
175}
176
177#define ID_PAT "/*_ID.{der,pem}"
178#define ATTR_PAT "/*_attr.xml"
179
180static int is_regular_file(char *filename)
181{
182   struct stat sb;
183   if(stat(filename,&sb) == -1)
184       return 0;
185   if((sb.st_mode & S_IFMT) == S_IFREG)
186       return 1;
187   return 0;
188}
189
190/**
191 * Load a directory full of certs.
192 */
193void abac_context_load_directory(abac_context_t *ctx, char *path) {
194    DIR *dp;
195    struct dirent *ep;
196     
197    dp = opendir (path);
198    if (dp != NULL) {
199        while (ep = readdir (dp)) {
200            if(is_regular_file(ep->d_name)) {
201                int ret = abac_context_load_id_file(ctx, ep->d_name);
202                if (ret == ABAC_CERT_SUCCESS) {
203                    if(debug) fprintf(stderr,"abac_context_load_directory, found an id %s\n",ep->d_name);
204                    continue;
205                }
206                ret = abac_context_load_attribute_file(ctx, ep->d_name);
207                if (ret == ABAC_CERT_SUCCESS) {
208                    if(debug) fprintf(stderr,"abac_context_load_directory, found an attr %s\n",ep->d_name);
209                }
210            }
211        }
212        (void) closedir (dp);
213    } else fprintf(stderr, "abac_load_directory, Couldn't open the directory\n");
214}
215
216/**
217 * Run a query on the data in an abac context. Returns a NULL-terminated array
218 * of abac_credential_t. Success/failure in *success.
219 */
220abac_credential_t **abac_context_query(abac_context_t *ctx, char *role, char *principal, int *success) {
221    abac_credential_t **credentials = NULL, *cur;
222    int i = 0;
223
224    assert(ctx != NULL); assert(role != NULL); assert(principal != NULL); assert(success != NULL);
225
226    abac_graph_t *result_graph = abac_graph_query(ctx->graph, role, principal);
227    abac_list_t *result = abac_graph_credentials(result_graph);
228
229    abac_graph_free(result_graph);
230
231    int size = abac_list_size(result);
232    if (size > 0)
233        *success = 1;
234
235    // if there is no actual path, return everything that can reach the role
236    else {
237        *success = 0;
238        abac_list_free(result);
239        result_graph = abac_graph_new();
240
241        // TODO: This can probably be better, but it now returns an
242        // approximation of a partial proof.  It returns all the attributes the
243        // principal can reach and all the attributes that will lead to a
244        // success.
245
246        /* Get all the attributes of the principal.  This calls sub-queries to
247         * flesh out the indirect proofs. */
248        result_graph = abac_graph_principal_creds(ctx->graph, principal);
249
250        /* This gets all the attributes linked to the target en route to the
251         * principal. */
252        result = abac_graph_postorder_credentials(ctx->graph, role);
253
254        /* Merge responses */
255        abac_list_foreach(result, cur,
256            abac_graph_add_credential(result_graph, cur);
257        );
258        abac_list_free(result);
259        abac_graph_derive_links(result_graph);
260
261        result = abac_graph_credentials(result_graph);
262        abac_graph_free(result_graph);
263
264        size = abac_list_size(result);
265    }
266
267    // make the array (leave space to NULL terminate it)
268    //      n.b., even if the list is empty, we still return an array that
269    //            only contains the NULL terminator
270    credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1));
271    abac_list_foreach(result, cur,
272        credentials[i++] = cur;
273    );
274    credentials[i] = NULL;
275
276    abac_list_free(result);
277
278    return credentials;
279}
280
281
282/**
283 * A NULL-terminated array of all the credentials in the context.
284 */
285abac_credential_t **abac_context_credentials(abac_context_t *ctx) {
286    abac_credential_t *cred;
287    int i = 0;
288
289    assert(ctx != NULL);
290
291    abac_list_t *cred_list = abac_graph_credentials(ctx->graph);
292    int size = abac_list_size(cred_list);
293
294    abac_credential_t **credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1));
295    abac_list_foreach(cred_list, cred,
296        credentials[i++] = cred;
297    );
298    credentials[i] = NULL;
299
300    abac_list_free(cred_list);
301
302    if(debug) {
303        abac_id_cert_t **ilist=abac_context_principals(ctx);
304        abac_id_cert_t *cert;
305        if (ilist != NULL)
306            for (i = 0; ilist[i] != NULL; ++i) {
307                cert = ilist[i];
308                printf("id[%d] %s\n",i, abac_id_cert_keyid(cert));
309            }
310        abac_context_id_credentials_free(ilist);
311    }
312
313    return credentials;
314}
315
316/*
317 * Replace known keyids with their nicknames (mnemonic names).  If a non-NULL
318 * string is returned it needs to be freed by the caller.
319 */
320char *abac_context_expand_key(abac_context_t *ctxt, char *s ) {
321    if ( ctxt->keymap ) 
322        return abac_keyid_map_expand_key(ctxt->keymap, s);
323    else
324        return NULL;
325}
326
327/*
328 * Replace known nicknames(mnemonic names)  with their keyids.  If a non-NULL
329 * string is returned it needs to be freed by the caller.
330 */
331char *abac_context_expand_nickname(abac_context_t *ctxt, char *s ) {
332    if ( ctxt->keymap ) 
333        return abac_keyid_map_expand_nickname(ctxt->keymap, s);
334    else
335        return NULL;
336}
337
338/*
339 * Add a nickname to the context.  The keyid must be known to the context.  If
340 * the nickname is in use, it is disambiguated.  Call abac_context_expand_key
341 * to see the assigned name if that is required.  Existing nickname for keyid
342 * is overwritten.  Returns true if the change was successful.
343 */
344int abac_context_set_nickname(abac_context_t *ctxt, char *key, char*nick) {
345    char *p = NULL;
346
347    if ( !ctxt->keymap) return 0;
348    /* Make sure we know the key.  Free the returned nickname */
349    if ( !(p = abac_keyid_map_key_to_nickname(ctxt->keymap, key))) return 0;
350    else free(p);
351
352    abac_keyid_map_remove_keyid(ctxt->keymap, key);
353    return abac_keyid_map_add_nickname(ctxt->keymap, key, nick);
354}
355
356/*
357 * Get direct access to the context's keyid mapping.  Used internally.  This
358 * does not make a reference to the map, use abac_keyid_map_dup if that is
359 * required.
360 */
361abac_keyid_map_t *abac_context_get_keyid_map(abac_context_t *ctxt) {
362    return ctxt->keymap;
363}
364
365
366/**
367 * A NULL-terminated array of all the principals in the context.
368 */
369abac_id_cert_t **abac_context_principals(abac_context_t *ctx)
370{
371    abac_id_cert_t **principals = NULL, *cur;
372    assert(ctx != NULL);
373
374    int size = abac_list_size(ctx->id_certs);
375
376    // make the array (leave space to NULL terminate it)
377    //      n.b., even if the list is empty, we still return an array that
378    //            only contains the NULL terminator
379    principals = abac_xmalloc(sizeof(abac_id_cert_t *) * (size + 1));
380    int i = 0;
381    abac_id_cert_t *id_cert;
382    abac_list_foreach(ctx->id_certs, id_cert,
383        principals[i]=abac_id_cert_dup(id_cert);
384        i++;
385    );
386    principals[i] = NULL;
387
388    return principals;
389}
390
391
392/**
393 * Frees a NULL-terminated list of credentials.
394 */
395void abac_context_credentials_free(abac_credential_t **credentials) {
396    int i;
397
398    if (credentials == NULL)
399        return;
400
401    for (i = 0; credentials[i] != NULL; ++i)
402        abac_credential_free(credentials[i]);
403    free(credentials);
404}
405
406/**
407 * Frees a NULL-terminated list of id credentials
408 */
409void abac_context_id_credentials_free(abac_id_cert_t **id_credentials) {
410    int i;
411
412    if (id_credentials == NULL)
413        return;
414
415    for (i = 0; id_credentials[i] != NULL; ++i) {
416        abac_id_cert_free(id_credentials[i]);
417    }
418    free(id_credentials);
419}
420
421
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