forked from pquerna/mod_authn_yubikey
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathmod_authn_yubikey.c
executable file
·677 lines (592 loc) · 30.7 KB
/
mod_authn_yubikey.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
/*
* Copyright [2008] [Jens Frey]
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
/*
* If you have any questions feel free to contact me
* at jens.frey@coffeecrew.org
*
*/
#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "ap_config.h"
#include "http_log.h"
#include "mod_auth.h"
#include "libykclient.h"
#include "ap_provider.h"
#include "apr_strings.h"
#include "apr_dbm.h"
#include "apr_time.h"
#include "http_core.h"
#include "http_request.h"
#include "mod_authn_yubikey.h"
#define APR_WANT_STRFUNC /* for strcasecmp */
#include "apr_want.h"
#define YUBIKEY_TOKEN_LENGTH 44
#define YUBIKEY_ID_LENGTH 12
#define LOG_PREFIX "[mod_authn_yubikey] "
#define MOD_AUTHN_YUBIKEY_NAME "mod_authn_yubikey"
#define MOD_AUTHN_YUBIKEY_VERSION "0.1"
#define ERROR_TEXT "<html> <head>" \
"<title>Error: SSL (https) connection required</title></head>" \
"<body style=\"background-color: black; color: #FF3700;\">" \
"<div style=\"border: 1px dashed #FFE268; height: 64px; padding: 2px;\">" \
"<img src=\"data:image/png;base64,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\" alt=\"Lock image\" width=\"64\" height=\"64\" style=\"float: left;\"/>" \
"<div style=\"border-left: 2px solid #FFE268; margin-left: 68px; padding-left:8px;\"><span style=\"font-size: 160%; font-weight: bold;\">This site is configured to require an SSL (https) connection.</span></div>" \
"</div>" \
"<p style=\"clear: both;\">" \
"You may want to try chaning http to https in your address bar.<br/>" \
"If you think this is an error, please contact the administrator." \
"</p></body></html>"
#define HDR_YK_AUTH_TYPE "X-Yubi-Auth-Type"
/* One factor (just token) */
#define YK_AUTH_TYPE_OF "OneFactor"
/* Two factor , password and token */
#define YK_AUTH_TYPE_TF "TwoFactor"
module AP_MODULE_DECLARE_DATA authn_yubikey_module;
/* Default values */
#define DEFAULT_TIMEOUT 43200 /* 12h */
#define DEFAULT_REQUIRE_SECURE (TRUE)
#define DEFAULT_EXTERNAL_ERROR_PAGE (FALSE)
#define DEFAULT_USER_DB "conf/ykUserDb"
#define DEFAULT_TMP_DB "conf/ykTmpDb"
#define UNSET -1
/* A helper */
static apr_datum_t string2datum(const char * toStore, request_rec *r)
{
apr_datum_t dt;
dt.dptr = apr_pstrdup(r->pool, (char*) toStore);
#ifndef NETSCAPE_DBM_COMPAT
dt.dsize = strlen(dt.dptr);
#else
dt.dsize = strlen(dt.dptr) + 1;
#endif
return dt;
}
static void openDb(apr_dbm_t **userDbm, const char *dbFilename, request_rec *r)
{
apr_status_t rv;
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r, LOG_PREFIX "Opening db ...");
rv = apr_dbm_open(userDbm, dbFilename, APR_DBM_RWCREATE, APR_FPROT_OS_DEFAULT, r->pool);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, LOG_PREFIX "Error opening db %s ...", dbFilename);
}
}
static void closeDb(apr_dbm_t *userDbm, request_rec *r)
{
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r, LOG_PREFIX "Closing db ...");
apr_dbm_close(userDbm);
}
/* User Key because the username is the key to the db */
static void deleteKeyFromDb(apr_dbm_t *userDbm, const char *userKey, request_rec *r)
{
apr_datum_t key;
apr_status_t rv;
key = string2datum(userKey, r);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "Deleting key %s",
key.dptr);
rv = apr_dbm_delete(userDbm, key);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
LOG_PREFIX "Could not delete key %s",
key.dptr);
}
}
static apr_status_t setUserInDb(apr_dbm_t *userDbm,
const char *user,
const char *password,
request_rec *r)
{
char *timeAuthenticated = NULL;
char *dbToken = NULL; //This is used to store pw:date
apr_datum_t key, value;
apr_status_t rv;
/* Built up some combination of token:time */
timeAuthenticated = apr_psprintf(r->pool, "%" APR_TIME_T_FMT, (apr_time_t) (apr_time_sec(apr_time_now())));
dbToken = apr_pstrcat(r->pool, password, ":", timeAuthenticated, NULL);
/* store OTP:time combo with username as key in DB */
key = string2datum(user, r);
value = string2datum(dbToken, r);
/* Pump user into db, store un, cookie value, creation date,
* let this expire sometime
*/
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r, LOG_PREFIX "Writing key: %s and value: %s to db",
key.dptr, value.dptr);
rv = apr_dbm_store(userDbm, key, value);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, LOG_PREFIX "Error writing to db ... with key: %s and value: %s",
key.dptr, value.dptr);
}
/* Spit back, so we can decide wheather s.th. went wrong or not */
return rv;
}
static int passwordExpired(const char *user,
apr_time_t lookedUpDate,
apr_time_t timeout,
request_rec *r)
{
if ((apr_time_sec(apr_time_now())) > (lookedUpDate + timeout)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r, LOG_PREFIX "Session expired for user %s", user);
return TRUE;
}
return FALSE;
}
static int isUserValid(const char *user,
const char *password,
yubiauth_dir_cfg *cfg,
request_rec *r)
{
ap_configfile_t *f;
char l[MAX_STRING_LEN];
apr_status_t status;
char *file_password = NULL;
char *yubiKeyId = NULL;
char *userPassword = NULL;
apr_size_t passwordLength = 0;
char *realName = NULL;
int userWasFound = FALSE;
/* This is TRUE when we store a combination of yubikeyId:username:password,
* we then have a two factor authentication.
*/
int tokenHasPassword = FALSE;
status = ap_pcfg_openfile(&f, r->pool, cfg->userAuthDbFilename);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r,
LOG_PREFIX "Could not open AuthYkUserFile file: %s",
cfg->userAuthDbFilename);
return FALSE;
}
/* Do length check of at least the password part,
* to be a yubikey token, it has to have at least 44
* characters from where the first 12 are the ID of the user.
*/
if (strlen(password) < YUBIKEY_TOKEN_LENGTH) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
LOG_PREFIX "The entered password cannot be a yubikey generated token");
ap_cfg_closefile(f);
return FALSE;
}
/* If the password is bigger then 44 characters, then we have an additional password
* set into the field, since the produced token by the yubikey is 44 characters long
*/
passwordLength = (apr_size_t) strlen(password) - YUBIKEY_TOKEN_LENGTH;
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The length of the entered password is: %d", passwordLength);
/* We have to distinct between a 44 character string which is the
* toke output only and a longer string, which would contain a
* password at its beginning
*/
if (strlen(password) > YUBIKEY_TOKEN_LENGTH) {
/* copy off the password part from the password string */
userPassword = apr_pstrndup(r->pool, password, passwordLength);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The entered password is: %s", userPassword);
}
/* Now move the password pointer forward the number of calculatd characters for the userPassword,
* we move the pointer beyond the last read character (not -1), to start reading the real stuff
*/
yubiKeyId = apr_pstrndup(r->pool, &password[passwordLength], (apr_size_t) YUBIKEY_ID_LENGTH);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The calculated YubiKey ID is: %s", yubiKeyId);
/* Find the TokenID/UN:PW solution in the file */
while (!(ap_cfg_getline(l, MAX_STRING_LEN, f))) {
const char *rpw, *w;
char *unPw = NULL;
/* Skip # or blank lines. */
if ((l[0] == '#') || (!l[0])) {
continue;
}
rpw = l;
w = ap_getword(r->pool, &rpw, ':');
/* The first 12 chars are the ID which must be available in this file
* else the user might be a yubikey user, but possibly a user we don't
* want.
*/
if (!strncmp(yubiKeyId, w, 12)) {
/* This would fetch the real username,
* after the ID could be located
*/
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "Could find the ID: %s", w);
/* remember, since we are working with the passwd
* utility, this realName is hashed
*/
realName = ap_getword(r->pool, &rpw, '\n');
apr_table_set(r->headers_in, HDR_YK_AUTH_TYPE, YK_AUTH_TYPE_OF);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The looked up realname is: %s", realName);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The looked up userPassword is: %s", userPassword);
/* this results in username:password as it should be entered in the install dialog */
if (userPassword) {
unPw = apr_pstrcat(r->pool, user, ":", userPassword, NULL);
apr_table_set(r->headers_in, HDR_YK_AUTH_TYPE, YK_AUTH_TYPE_TF);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The built un:pw combo is: %s", unPw);
}
/* If there is a password set, use the username:password combo,
* else just compare the username
*/
status = apr_password_validate(userPassword?unPw:user, realName);
if (status == APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "Could map ID %s to User: %s", w, user);
userWasFound = TRUE;
break;
}
}
}
ap_cfg_closefile(f);
return userWasFound;
}
/* This does some initial checking, like if we're running on a SSL line or not */
static int checkInitial(request_rec *r)
{
return OK;
yubiauth_dir_cfg *cfg = ap_get_module_config(r->per_dir_config, &authn_yubikey_module);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "requireSecure: %d", cfg->requireSecure);
/* If no securiy is wanted or scheme is already https */
if (!cfg->requireSecure || !strncmp(ap_http_scheme(r), "https", 5)) {
return OK;
}
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
LOG_PREFIX "The server is configured to use HTTPS on URI: %s", r->uri);
if(cfg->externalErrorPage == TRUE){
/* We explicitly want that to be overridable */
//return HTTP_BAD_REQUEST;
return HTTP_NOT_ACCEPTABLE;
}
/* Tell the user/admin what's going on instead of just showing BAD_REQUEST */
ap_rputs(DOCTYPE_HTML_4_0T, r);
ap_set_content_type(r, "text/html;");
ap_rputs(ERROR_TEXT, r);
ap_finalize_request_protocol(r);
return HTTP_BAD_REQUEST;
}
static authn_status authn_check_otp(request_rec *r, const char *user,
const char *password)
{
apr_status_t rv;
apr_dbm_t *userDbm = NULL;
yubiauth_dir_cfg *cfg = ap_get_module_config(r->per_dir_config, &authn_yubikey_module);
apr_datum_t key,dbUserRecord;
key.dptr = NULL;
dbUserRecord.dptr = NULL;
char *lookedUpToken = NULL;
char *lookedUpPassword = NULL; //This is the OTP token
apr_size_t passwordLength = 0;
apr_time_t lookedUpDate = 0;
/* No username and no password is set */
if (!*user || !*password)
return AUTH_DENIED;
/* Since the password field contains possibly a password and the OTP token, we
* have to break that up here
*/
passwordLength = (apr_size_t) strlen(password) - YUBIKEY_TOKEN_LENGTH;
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "Username is: %s and password is: %s", user, &password[passwordLength]);
/* Now open the User DB and see if the user really is one of us.
* for that we save the 12char token:username combo.
* Ideally we can fill that with the htpasswd utility
* NOTE: enter full password here
*/
if (!isUserValid(user, password, cfg, r)) {
return AUTH_DENIED;
}
openDb(&userDbm, cfg->tmpAuthDbFilename, r);
key = string2datum(user, r);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r, LOG_PREFIX "Fetching token (pw:time) for user %s from db ...", user);
rv = apr_dbm_fetch(userDbm, key, &dbUserRecord);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, LOG_PREFIX "unable to fetch the user (%s) from the"
"Database, better abort here.", user);
closeDb(userDbm, r);
return HTTP_INTERNAL_SERVER_ERROR;
}
if (dbUserRecord.dptr != NULL) {
/* it's separated pw:time here */
const char *sep = ":";
char *time;
lookedUpToken = apr_pstrmemdup(r->pool, dbUserRecord.dptr, dbUserRecord.dsize);
/* Break down the token into it's pw:time components */
lookedUpPassword = apr_strtok(lookedUpToken, sep, &time);
lookedUpDate = (apr_time_t) apr_atoi64(time);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "We could extrace these values from the token:");
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The looked up token for the user: %s",
user);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The looked up password: %s",
lookedUpPassword);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The looked up time: %" APR_TIME_T_FMT,
lookedUpDate);
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r,
LOG_PREFIX "The looked up token: %s",
lookedUpToken);
}
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_DEBUG, 0, r, LOG_PREFIX "Fetched token (%s) ...", lookedUpToken);
/* password has to be set, if the pw content is NULL or empty, we have
* catched that earlier ...
*/
if (lookedUpPassword != NULL && !strcmp(lookedUpPassword, &password[passwordLength])) {
/* The date expired */
if (passwordExpired(user, lookedUpDate, cfg->timeoutSeconds, r)) {
/* Delete user record */
deleteKeyFromDb(userDbm, user, r);
closeDb(userDbm, r);
return AUTH_DENIED;
}
else {
closeDb(userDbm, r);
return AUTH_GRANTED;
}
}
else {
int authenticationSuccessful = 0;
int ret = YUBIKEY_CLIENT_BAD_OTP;
/* We could not lookup the password, verify the sent password */
ret = yubikey_client_simple_request(&password[passwordLength], 1, 0, NULL, r);
if (ret == YUBIKEY_CLIENT_OK) {
authenticationSuccessful = 1;
} else {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
LOG_PREFIX "Authentication failed, reason: %s",
yubikey_client_strerror(ret));
return AUTH_DENIED;
}
/* We could successfully authenticate the user */
if (authenticationSuccessful) {
/* Try to write the user into the db */
if (setUserInDb(userDbm, user, &password[passwordLength], r)
!= APR_SUCCESS) {
/* Abort, we could not write the user into the db after
* authenticating him ...
*/
closeDb(userDbm, r);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* User could be written to the db*/
closeDb(userDbm, r);
return AUTH_GRANTED;
}
/* Could not authenticate successful */
closeDb(userDbm, r);
return AUTH_DENIED;
}
/* Something went wrong or we did not think about it, better deny */
closeDb(userDbm, r);
return AUTH_DENIED;
}
/* This provides a simple UI for accessing the key database
* used to grant access to users owning a yubikey or not.
*
* This is primarily a web version of htaccess.
*/
static int authn_yubikey_handler(request_rec *r)
{
ap_configfile_t *f;
char l[MAX_STRING_LEN];
apr_status_t status;
char *file_password = NULL;
char *yubiKeyId = NULL;
char *realName = NULL;
apr_file_t *dbFormFile = NULL;
yubiauth_dir_cfg *cfg = ap_get_module_config(r->per_dir_config, &authn_yubikey_module);
if (strcmp(r->handler, "authn_yubikey")) {
return DECLINED;
}
r->content_type = "text/html";
/* Post back */
if (r->method_number == M_POST) {
const char *postbackContent = NULL;
char *tmp = NULL;
char buffer[1024];
//Read the POST data sent from the client
ap_setup_client_block(r, REQUEST_CHUNKED_DECHUNK);
if ( ap_should_client_block(r) == 1 ) {
while ( ap_get_client_block(r, buffer, 1024) > 0 ) {
postbackContent = apr_pstrcat(r->pool, buffer, tmp, NULL);
//tmp = apr_pstrdup(r->pool, postbackContent);
}
}
else {
ap_rputs("No POST data available",r);
}
//We have the data now, now process it and save it into the db
ap_set_content_type(r, "text/plain;");
ap_rprintf(r, "Postback content: %s", postbackContent);
return OK;
}
/* Serve content if it's a GET request */
if (!r->header_only) {
ap_rputs("<html><head><title>YubiAuth user management</title></head><body>", r);
ap_rputs("<h1>Welcome to the YubiAuth user Mgmt.</h1><br>", r);
ap_rputs("The following users could be found inside the database:<br>", r);
//Open userDb file for looped output
status = ap_pcfg_openfile(&f, r->pool, cfg->userAuthDbFilename);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r,
LOG_PREFIX "Could not open YubiAuthUserDb file: %s",
cfg->userAuthDbFilename);
return HTTP_INTERNAL_SERVER_ERROR;
}
ap_rputs("<table><thead><tr><th>TokenId</th><th>Real Name</th></tr></thead><tbody>\n", r);
while (!(ap_cfg_getline(l, MAX_STRING_LEN, f))) {
const char *rpw, *w;
/* Skip # or blank lines. */
if ((l[0] == '#') || (!l[0])) {
continue;
}
rpw = l;
w = ap_getword(r->pool, &rpw, ':');
//yubiKeyId = apr_pstrndup(r->pool, password, (apr_size_t) 12);
//realName = ap_getword(r->pool, &rpw, ':');
ap_rputs("<tr>", r);
ap_rprintf(r, "<td>%s</td>", w);
ap_rprintf(r, "<td>%s</td>\n", rpw);
ap_rputs("</tr>", r);
}
ap_cfg_closefile(f);
ap_rputs("</tbody></table>", r);
ap_rputs("<h1>Want to add a user?</h1>.", r);
ap_rputs("<form name=\"addUser\" method=\"POST\" action=\"/authme\">", r);
ap_rputs("<input type=\"text\" name=\"tokenId\">", r);
ap_rputs("<input type=\"text\" name=\"realUser\">", r);
ap_rputs("<input type=\"submit\" value=\"Add User\">", r);
ap_rputs("</form>", r);
ap_rputs("</body></html>", r);
}
//If we receive a POST to this location, we probably want to update the userdb
//be sure to check if there is a user set and that this user is allowed to change information
// inside the userdb, we cn authenticate the user with the OTP token here too.
//We should make the administrative user configurable, by specifying the token which is allowed
// access ...
return OK;
}
static const authn_provider authn_yubikey_provider = {
&authn_check_otp,
NULL
};
static int init_mod_yk(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
{
ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
LOG_PREFIX "Version [" MOD_AUTHN_YUBIKEY_VERSION "] initialized");
ap_add_version_component(pconf, MOD_AUTHN_YUBIKEY_NAME "/" MOD_AUTHN_YUBIKEY_VERSION);
return OK;
}
static void authn_yubikey_register_hooks(apr_pool_t *p)
{
//static const char *const aszSucc[] = { "mod_authz_user.c", NULL };
//ap_hook_auth_checker(authz_check_yubi_user, NULL, aszSucc, APR_HOOK_MIDDLE);
/* No content handler for this one */
//ap_hook_handler(authn_yubikey_handler, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_header_parser(checkInitial, NULL, NULL, APR_HOOK_MIDDLE);
ap_register_provider(p, AUTHN_PROVIDER_GROUP, "yubikey", "0", &authn_yubikey_provider);
ap_hook_post_config(init_mod_yk, NULL, NULL, APR_HOOK_MIDDLE);
}
static const command_rec authn_yubikey_cmds[] = {
AP_INIT_TAKE1("AuthYubiKeyTmpFile", ap_set_file_slot,
(void*) APR_OFFSETOF(yubiauth_dir_cfg, tmpAuthDbFilename),
ACCESS_CONF, "The temporary filename for authenticated users"),
AP_INIT_TAKE1("AuthYubiKeyUserFile", ap_set_file_slot,
(void*) APR_OFFSETOF(yubiauth_dir_cfg, userAuthDbFilename),
ACCESS_CONF, "The filename for allowed users"),
AP_INIT_TAKE1("AuthYubiKeyTimeout", ap_set_int_slot,
(void*) APR_OFFSETOF(yubiauth_dir_cfg, timeoutSeconds),
ACCESS_CONF, "The timeout when users have to reauthenticate (Default 43200 seconds [12h])"),
AP_INIT_TAKE1("AuthYkValidationProtocol", ap_set_string_slot,
(void*) APR_OFFSETOF(yubiauth_dir_cfg, validationProtocol),
ACCESS_CONF, "The protocol of the URL of the location where the key can be" \
"authenticated"),
AP_INIT_TAKE1("AuthYkValidationHost", ap_set_string_slot,
(void*) APR_OFFSETOF(yubiauth_dir_cfg, validationHost),
ACCESS_CONF, "The host of the URL of the location where the key can be" \
"authenticated"),
AP_INIT_FLAG("AuthYubiKeyExternalErrorPage", ap_set_flag_slot,
(void*) APR_OFFSETOF(yubiauth_dir_cfg, externalErrorPage),
ACCESS_CONF, "If SSL is required display internal error page, or display custom (406) error" \
"page (Default Off)"),
AP_INIT_FLAG("AuthYubiKeyRequireSecure", ap_set_flag_slot,
(void*) APR_OFFSETOF(yubiauth_dir_cfg, requireSecure),
ACCESS_CONF|RSRC_CONF,
"Whether or not a secure site is required to pass authentication (Default On)"),
{NULL}
};
static void *create_yubiauth_dir_cfg(apr_pool_t *pool, char *x)
{
yubiauth_dir_cfg *dir = apr_pcalloc(pool, sizeof (yubiauth_dir_cfg));
/* Set defaults configuration here
*/
dir->timeoutSeconds = UNSET;
dir->requireSecure = UNSET;
dir->externalErrorPage = UNSET;
dir->tmpAuthDbFilename = NULL;
dir->userAuthDbFilename = NULL;
dir->validationProtocol = NULL;
dir->validationHost = NULL;
return dir;
}
static void *merge_yubiauth_dir_cfg(apr_pool_t *pool, void *BASE, void *ADD)
{
yubiauth_dir_cfg *base = BASE;
yubiauth_dir_cfg *add = ADD;
yubiauth_dir_cfg *dir = apr_pcalloc(pool, sizeof (yubiauth_dir_cfg));
/* merge */
dir->timeoutSeconds = (add->timeoutSeconds == UNSET) ? base->timeoutSeconds : add->timeoutSeconds;
dir->requireSecure = (add->requireSecure == UNSET) ? base->requireSecure : add->requireSecure;
dir->externalErrorPage = (add->externalErrorPage == UNSET) ? base->externalErrorPage : add->externalErrorPage;
dir->userAuthDbFilename = (add->userAuthDbFilename == NULL) ? base->userAuthDbFilename : add->userAuthDbFilename;
dir->tmpAuthDbFilename = (add->tmpAuthDbFilename == NULL) ? base->tmpAuthDbFilename : add->tmpAuthDbFilename;
dir->validationHost = (add->validationHost == NULL) ? base->validationHost : add->validationHost;
dir->validationProtocol = (add->validationProtocol == NULL) ? base->validationProtocol : add->validationProtocol;
/* Set defaults configuration here
*/
if (dir->timeoutSeconds == UNSET) {
dir->timeoutSeconds = DEFAULT_TIMEOUT;
}
if (dir->requireSecure == UNSET) {
dir->requireSecure = DEFAULT_REQUIRE_SECURE;
}
if (dir->externalErrorPage == UNSET) {
dir->externalErrorPage = DEFAULT_EXTERNAL_ERROR_PAGE;
}
if (dir->userAuthDbFilename == NULL) {
dir->userAuthDbFilename = ap_server_root_relative(pool, DEFAULT_USER_DB);
}
if (dir->tmpAuthDbFilename == NULL) {
dir->tmpAuthDbFilename = ap_server_root_relative(pool, DEFAULT_TMP_DB);
}
if (dir->validationHost == NULL) {
dir->validationHost = "api.yubico.com";
}
if (dir->validationProtocol == NULL) {
dir->validationProtocol = "https";
}
return dir;
}
/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA authn_yubikey_module = {
STANDARD20_MODULE_STUFF,
&create_yubiauth_dir_cfg, /* create per-dir config structures */
&merge_yubiauth_dir_cfg, /* merge per-dir config structures */
NULL, /* create per-server config structures */
NULL, /* merge per-server config structures */
authn_yubikey_cmds, /* table of config file commands */
authn_yubikey_register_hooks /* register hooks */
};