/[LeafOK_CVS]/lbbs/src/login.c
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Contents of /lbbs/src/login.c

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Revision 1.77 - (show annotations)
Fri Dec 26 11:17:41 2025 UTC (2 months, 2 weeks ago) by sysadm
Branch: MAIN
Changes since 1.76: +15 -13 lines
Content type: text/x-csrc
Refine log of user authentication

1 /* SPDX-License-Identifier: GPL-3.0-or-later */
2 /*
3 * login
4 * - user authentication and online status manager
5 *
6 * Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
7 */
8
9 #ifdef HAVE_CONFIG_H
10 #include "config.h"
11 #endif
12
13 #include "bbs.h"
14 #include "common.h"
15 #include "database.h"
16 #include "io.h"
17 #include "ip_mask.h"
18 #include "log.h"
19 #include "login.h"
20 #include "screen.h"
21 #include "user_priv.h"
22 #include <ctype.h>
23 #include <errno.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <regex.h>
27 #include <unistd.h>
28 #include <mysql.h>
29 #include <sys/param.h>
30
31 static const int BBS_username_min_len = 3; // common len = 5, special len = 3
32 static const int BBS_password_min_len = 5; // legacy len = 5, current len = 6
33
34 static const int BBS_allowed_login_failures_within_interval = 10;
35 static const int BBS_login_failures_count_interval = 10; // minutes
36 static const int BBS_allowed_login_failures_per_account = 3;
37
38 const int BBS_login_retry_times = 3;
39
40 int bbs_login(void)
41 {
42 char username[BBS_username_max_len + 1];
43 char password[BBS_password_max_len + 1];
44 int i;
45 int ret;
46
47 for (i = 0; !SYS_server_exit && i < BBS_login_retry_times; i++)
48 {
49 prints("\033[1;33m请输入帐号\033[m(试用请输入`\033[1;36mguest\033[m', "
50 "注册请输入`\033[1;31mnew\033[m'): ");
51 iflush();
52
53 if (str_input(username, sizeof(username), DOECHO) < 0)
54 {
55 continue;
56 }
57
58 if (strcmp(username, "guest") == 0)
59 {
60 load_guest_info();
61 log_common("User [%s] authenticated successfully", username);
62 return 0;
63 }
64
65 if (strcmp(username, "new") == 0)
66 {
67 display_file(DATA_REGISTER, 1);
68 return -1;
69 }
70
71 if (username[0] != '\0')
72 {
73 prints("\033[1;37m请输入密码\033[m: ");
74 iflush();
75
76 if (str_input(password, sizeof(password), NOECHO) < 0)
77 {
78 continue;
79 }
80
81 ret = check_user(username, password);
82 if (ret == 2) // Enforce update user agreement
83 {
84 BBS_update_eula = 1;
85 ret = 0;
86 }
87
88 if (ret == 0)
89 {
90 log_common("User [%s] authenticated successfully", username);
91 return 0;
92 }
93
94 log_common("User [%s] authentication failed (%d/%d)", username,
95 i + 1, BBS_login_retry_times);
96 iflush();
97 }
98 }
99
100 display_file(DATA_LOGIN_ERROR, 1);
101 return -1;
102 }
103
104 int check_user(const char *username, const char *password)
105 {
106 MYSQL *db = NULL;
107 MYSQL_RES *rs = NULL;
108 MYSQL_ROW row;
109 char sql[SQL_BUFFER_LEN];
110 int ret = 0;
111 int BBS_uid = 0;
112 char client_addr[IP_ADDR_LEN];
113 int i;
114 int ok = 1;
115 char user_tz_env[BBS_user_tz_max_len + 2];
116
117 db = db_open();
118 if (db == NULL)
119 {
120 ret = -1;
121 goto cleanup;
122 }
123
124 // Verify format
125 for (i = 0; ok && username[i] != '\0'; i++)
126 {
127 if (!(isalpha((int)username[i]) || (i > 0 && (isdigit((int)username[i]) || username[i] == '_'))))
128 {
129 ok = 0;
130 }
131 }
132 if (ok && (i < BBS_username_min_len || i > BBS_username_max_len))
133 {
134 ok = 0;
135 }
136 for (i = 0; ok && password[i] != '\0'; i++)
137 {
138 if (!isalnum((int)password[i]))
139 {
140 ok = 0;
141 }
142 }
143 if (ok && (i < BBS_password_min_len || i > BBS_password_max_len))
144 {
145 ok = 0;
146 }
147
148 if (!ok)
149 {
150 prints("\033[1;31m用户名或密码格式错误...\033[m\r\n");
151 ret = 1;
152 goto cleanup;
153 }
154
155 // Begin transaction
156 if (mysql_query(db, "SET autocommit=0") != 0)
157 {
158 log_error("SET autocommit=0 error: %s", mysql_error(db));
159 ret = -1;
160 goto cleanup;
161 }
162
163 if (mysql_query(db, "BEGIN") != 0)
164 {
165 log_error("Begin transaction error: %s", mysql_error(db));
166 ret = -1;
167 goto cleanup;
168 }
169
170 // Failed login attempts from the same source (subnet /24) during certain time period
171 strncpy(client_addr, hostaddr_client, sizeof(client_addr) - 1);
172 client_addr[sizeof(client_addr) - 1] = '\0';
173
174 snprintf(sql, sizeof(sql),
175 "SELECT COUNT(*) AS err_count FROM user_err_login_log "
176 "WHERE login_dt >= SUBDATE(NOW(), INTERVAL %d MINUTE) "
177 "AND login_ip LIKE '%s'",
178 BBS_login_failures_count_interval,
179 ip_mask(client_addr, 1, '%'));
180 if (mysql_query(db, sql) != 0)
181 {
182 log_error("Query user_list error: %s", mysql_error(db));
183 ret = -1;
184 goto cleanup;
185 }
186 if ((rs = mysql_store_result(db)) == NULL)
187 {
188 log_error("Get user_list data failed");
189 ret = -1;
190 goto cleanup;
191 }
192 if ((row = mysql_fetch_row(rs)))
193 {
194 if (atoi(row[0]) >= BBS_allowed_login_failures_within_interval)
195 {
196 prints("\033[1;31m来源存在多次失败登陆尝试,请稍后再试,或使用Web方式访问\033[m\r\n");
197 ret = 1;
198 goto cleanup;
199 }
200 }
201 mysql_free_result(rs);
202 rs = NULL;
203
204 // Failed login attempts against the current username since last successful login
205 snprintf(sql, sizeof(sql),
206 "SELECT COUNT(*) AS err_count FROM user_err_login_log "
207 "LEFT JOIN user_list ON user_err_login_log.username = user_list.username "
208 "LEFT JOIN user_pubinfo ON user_list.UID = user_pubinfo.UID "
209 "WHERE user_err_login_log.username = '%s' "
210 "AND (user_err_login_log.login_dt >= user_pubinfo.last_login_dt "
211 "OR user_pubinfo.last_login_dt IS NULL)",
212 username);
213 if (mysql_query(db, sql) != 0)
214 {
215 log_error("Query user_list error: %s", mysql_error(db));
216 ret = -1;
217 goto cleanup;
218 }
219 if ((rs = mysql_store_result(db)) == NULL)
220 {
221 log_error("Get user_list data failed");
222 ret = -1;
223 goto cleanup;
224 }
225 if ((row = mysql_fetch_row(rs)))
226 {
227 if (atoi(row[0]) >= BBS_allowed_login_failures_per_account)
228 {
229 prints("\033[1;31m账户存在多次失败登陆尝试,请使用Web方式登录解锁\033[m\r\n");
230 ret = 1;
231 goto cleanup;
232 }
233 }
234 mysql_free_result(rs);
235 rs = NULL;
236
237 snprintf(sql, sizeof(sql),
238 "SELECT UID, username, p_login FROM user_list "
239 "WHERE username = '%s' AND password = SHA2('%s', 256) AND enable",
240 username, password);
241 if (mysql_query(db, sql) != 0)
242 {
243 log_error("Query user_list error: %s", mysql_error(db));
244 ret = -1;
245 goto cleanup;
246 }
247 if ((rs = mysql_store_result(db)) == NULL)
248 {
249 log_error("Get user_list data failed");
250 ret = -1;
251 goto cleanup;
252 }
253 if ((row = mysql_fetch_row(rs)))
254 {
255 BBS_uid = atoi(row[0]);
256 strncpy(BBS_username, row[1], sizeof(BBS_username) - 1);
257 BBS_username[sizeof(BBS_username) - 1] = '\0';
258 int p_login = atoi(row[2]);
259
260 mysql_free_result(rs);
261 rs = NULL;
262
263 // Add user login log
264 snprintf(sql, sizeof(sql),
265 "INSERT INTO user_login_log(UID, login_dt, login_ip) "
266 "VALUES(%d, NOW(), '%s')",
267 BBS_uid, hostaddr_client);
268 if (mysql_query(db, sql) != 0)
269 {
270 log_error("Insert into user_login_log error: %s", mysql_error(db));
271 ret = -1;
272 goto cleanup;
273 }
274
275 // Commit transaction
276 if (mysql_query(db, "COMMIT") != 0)
277 {
278 log_error("Commit transaction error: %s", mysql_error(db));
279 ret = -1;
280 goto cleanup;
281 }
282
283 if (p_login == 0)
284 {
285 prints("\033[1;31m您目前无权登陆...\033[m\r\n");
286 ret = 1;
287 goto cleanup;
288 }
289 }
290 else
291 {
292 mysql_free_result(rs);
293 rs = NULL;
294
295 snprintf(sql, sizeof(sql),
296 "INSERT INTO user_err_login_log(username, password, login_dt, login_ip) "
297 "VALUES('%s', '%s', NOW(), '%s')",
298 username, password, hostaddr_client);
299 if (mysql_query(db, sql) != 0)
300 {
301 log_error("Insert into user_err_login_log error: %s", mysql_error(db));
302 ret = -1;
303 goto cleanup;
304 }
305
306 // Commit transaction
307 if (mysql_query(db, "COMMIT") != 0)
308 {
309 log_error("Commit transaction error: %s", mysql_error(db));
310 ret = -1;
311 goto cleanup;
312 }
313
314 prints("\033[1;31m错误的用户名或密码...\033[m\r\n");
315 ret = 1;
316 goto cleanup;
317 }
318
319 // Set AUTOCOMMIT = 1
320 if (mysql_query(db, "SET autocommit=1") != 0)
321 {
322 log_error("SET autocommit=1 error: %s", mysql_error(db));
323 ret = -1;
324 goto cleanup;
325 }
326
327 ret = load_user_info(db, BBS_uid);
328
329 switch (ret)
330 {
331 case 0: // Login successfully
332 if (!SSH_v2 && checklevel2(&BBS_priv, P_MAN_S))
333 {
334 prints("\033[1;31m非普通账户必须使用SSH方式登录\033[m\r\n");
335 ret = 1;
336 goto cleanup;
337 }
338 break;
339 case -1: // Load data error
340 prints("\033[1;31m读取用户数据错误...\033[m\r\n");
341 ret = -1;
342 goto cleanup;
343 case -2: // Enforce update user agreement
344 if (!SSH_v2 && checklevel2(&BBS_priv, P_MAN_S))
345 {
346 prints("\033[1;31m非普通账户必须使用SSH方式登录\033[m\r\n");
347 ret = 1;
348 goto cleanup;
349 }
350 ret = 2;
351 goto cleanup;
352 case -3: // Dead
353 prints("\033[1;31m很遗憾,您已经永远离开了我们的世界!\033[m\r\n");
354 ret = 1;
355 goto cleanup;
356 default:
357 ret = -2;
358 goto cleanup;
359 }
360
361 snprintf(sql, sizeof(sql),
362 "UPDATE user_pubinfo SET visit_count = visit_count + 1, "
363 "last_login_dt = NOW() WHERE UID = %d",
364 BBS_uid);
365 if (mysql_query(db, sql) != 0)
366 {
367 log_error("Update user_pubinfo error: %s", mysql_error(db));
368 ret = -1;
369 goto cleanup;
370 }
371
372 if (user_online_add(db) != 0)
373 {
374 ret = -1;
375 goto cleanup;
376 }
377
378 BBS_last_access_tm = BBS_login_tm = time(NULL);
379
380 // Set user tz to process env
381 if (BBS_user_tz[0] != '\0')
382 {
383 user_tz_env[0] = ':';
384 strncpy(user_tz_env + 1, BBS_user_tz, sizeof(user_tz_env) - 2);
385 user_tz_env[sizeof(user_tz_env) - 1] = '\0';
386
387 if (setenv("TZ", user_tz_env, 1) == -1)
388 {
389 log_error("setenv(TZ = %s) error %d", user_tz_env, errno);
390 return -3;
391 }
392
393 tzset();
394 }
395
396 log_common("User [%s] authenticated successfully", username);
397
398 cleanup:
399 mysql_free_result(rs);
400 mysql_close(db);
401
402 return ret;
403 }
404
405 int load_user_info(MYSQL *db, int BBS_uid)
406 {
407 MYSQL_RES *rs = NULL;
408 MYSQL_ROW row;
409 char sql[SQL_BUFFER_LEN];
410 int life;
411 time_t last_login_dt;
412 int ret = 0;
413
414 snprintf(sql, sizeof(sql),
415 "SELECT life, UNIX_TIMESTAMP(last_login_dt), user_timezone, exp, nickname "
416 "FROM user_pubinfo WHERE UID = %d",
417 BBS_uid);
418 if (mysql_query(db, sql) != 0)
419 {
420 log_error("Query user_pubinfo error: %s", mysql_error(db));
421 ret = -1;
422 goto cleanup;
423 }
424 if ((rs = mysql_store_result(db)) == NULL)
425 {
426 log_error("Get user_pubinfo data failed");
427 ret = -1;
428 goto cleanup;
429 }
430 if ((row = mysql_fetch_row(rs)))
431 {
432 life = atoi(row[0]);
433 last_login_dt = (time_t)atol(row[1]);
434
435 strncpy(BBS_user_tz, row[2], sizeof(BBS_user_tz) - 1);
436 BBS_user_tz[sizeof(BBS_user_tz) - 1] = '\0';
437
438 BBS_user_exp = atoi(row[3]);
439
440 strncpy(BBS_nickname, row[4], sizeof(BBS_nickname));
441 BBS_nickname[sizeof(BBS_nickname) - 1] = '\0';
442 }
443 else
444 {
445 ret = -1; // Data not found
446 goto cleanup;
447 }
448 mysql_free_result(rs);
449 rs = NULL;
450
451 if (life != 333 && life != 365 && life != 666 && life != 999 && // Not immortal
452 time(NULL) - last_login_dt > 60 * 60 * 24 * life)
453 {
454 ret = -3; // Dead
455 goto cleanup;
456 }
457
458 if (load_priv(db, &BBS_priv, BBS_uid) != 0)
459 {
460 ret = -1; // Data not found
461 goto cleanup;
462 }
463
464 if (last_login_dt < BBS_eula_tm)
465 {
466 ret = -2; // require update agreement first
467 goto cleanup;
468 }
469
470 cleanup:
471 mysql_free_result(rs);
472
473 return ret;
474 }
475
476 int load_guest_info(void)
477 {
478 MYSQL *db = NULL;
479 int ret = 0;
480
481 db = db_open();
482 if (db == NULL)
483 {
484 ret = -1;
485 goto cleanup;
486 }
487
488 strncpy(BBS_username, "guest", sizeof(BBS_username) - 1);
489 BBS_username[sizeof(BBS_username) - 1] = '\0';
490
491 BBS_user_exp = 0;
492
493 strncpy(BBS_nickname, "Guest", sizeof(BBS_nickname));
494 BBS_nickname[sizeof(BBS_nickname) - 1] = '\0';
495
496 if (load_priv(db, &BBS_priv, 0) != 0)
497 {
498 ret = -1;
499 goto cleanup;
500 }
501
502 if (user_online_add(db) != 0)
503 {
504 ret = -1;
505 goto cleanup;
506 }
507
508 BBS_last_access_tm = BBS_login_tm = time(NULL);
509
510 cleanup:
511 mysql_close(db);
512
513 return ret;
514 }
515
516 int user_online_add(MYSQL *db)
517 {
518 char sql[SQL_BUFFER_LEN];
519
520 snprintf(sql, sizeof(sql),
521 "INSERT INTO visit_log(dt, IP) VALUES(NOW(), '%s')",
522 hostaddr_client);
523 if (mysql_query(db, sql) != 0)
524 {
525 log_error("Add visit log error: %s", mysql_error(db));
526 return -1;
527 }
528
529 if (user_online_del(db) != 0)
530 {
531 return -2;
532 }
533
534 snprintf(sql, sizeof(sql),
535 "INSERT INTO user_online(SID, UID, ip, current_action, login_tm, last_tm) "
536 "VALUES('Telnet_Process_%d', %d, '%s', 'LOGIN', NOW(), NOW())",
537 getpid(), BBS_priv.uid, hostaddr_client);
538 if (mysql_query(db, sql) != 0)
539 {
540 log_error("Add user_online error: %s", mysql_error(db));
541 return -3;
542 }
543
544 return 0;
545 }
546
547 int user_online_del(MYSQL *db)
548 {
549 char sql[SQL_BUFFER_LEN];
550
551 snprintf(sql, sizeof(sql),
552 "DELETE FROM user_online WHERE SID = 'Telnet_Process_%d'",
553 getpid());
554 if (mysql_query(db, sql) != 0)
555 {
556 log_error("Delete user_online error: %s", mysql_error(db));
557 return -1;
558 }
559
560 return 0;
561 }
562
563 int user_online_exp(MYSQL *db)
564 {
565 char sql[SQL_BUFFER_LEN];
566
567 // +1 exp for every 5 minutes online since last logout
568 // but at most 24 hours worth of exp can be gained in Telnet session
569 snprintf(sql, sizeof(sql),
570 "UPDATE user_pubinfo SET exp = exp + FLOOR(LEAST(TIMESTAMPDIFF("
571 "SECOND, GREATEST(last_login_dt, IF(last_logout_dt IS NULL, last_login_dt, last_logout_dt)), NOW()"
572 ") / 60 / 5, 12 * 24)), last_logout_dt = NOW() "
573 "WHERE UID = %d",
574 BBS_priv.uid);
575 if (mysql_query(db, sql) != 0)
576 {
577 log_error("Update user_pubinfo error: %s", mysql_error(db));
578 return -1;
579 }
580
581 return 0;
582 }
583
584 int user_online_update(const char *action)
585 {
586 MYSQL *db = NULL;
587 char sql[SQL_BUFFER_LEN];
588
589 if ((action == NULL || strcmp(BBS_current_action, action) == 0) &&
590 time(NULL) - BBS_current_action_tm < BBS_current_action_refresh_interval) // No change
591 {
592 return 0;
593 }
594
595 if (action != NULL)
596 {
597 strncpy(BBS_current_action, action, sizeof(BBS_current_action) - 1);
598 BBS_current_action[sizeof(BBS_current_action) - 1] = '\0';
599 }
600
601 BBS_current_action_tm = time(NULL);
602
603 db = db_open();
604 if (db == NULL)
605 {
606 log_error("db_open() error: %s", mysql_error(db));
607 return -1;
608 }
609
610 snprintf(sql, sizeof(sql),
611 "UPDATE user_online SET current_action = '%s', last_tm = NOW() "
612 "WHERE SID = 'Telnet_Process_%d'",
613 BBS_current_action, getpid());
614 if (mysql_query(db, sql) != 0)
615 {
616 log_error("Update user_online error: %s", mysql_error(db));
617 return -2;
618 }
619
620 mysql_close(db);
621
622 return 1;
623 }
624
625 int user_update_agreement(void)
626 {
627 MYSQL *db = NULL;
628 char sql[SQL_BUFFER_LEN];
629 int ch;
630 int ret = 0;
631
632 clearscr();
633 moveto(2, 1);
634 prints("尊敬的用户:");
635 moveto(3, 1);
636 prints(" 本站的《用户许可协议》已更新,您必须在仔细阅读并接受后,才能继续使用本站提供的服务。");
637 press_any_key();
638
639 clearscr();
640 display_file(DATA_EULA, 1);
641
642 while (!SYS_server_exit)
643 {
644 clearscr();
645 moveto(2, 1);
646
647 ch = press_any_key_ex("您是否接受本站的《用户许可协议》? (A)接受, (D)拒绝, (R)再看看协议 [D]", 60);
648 switch (toupper(ch))
649 {
650 case KEY_NULL:
651 return -1;
652 case KEY_TIMEOUT:
653 case CR:
654 case 'D':
655 moveto(3, 1);
656 prints("您已拒绝《用户许可协议》,再见!");
657 press_any_key();
658 return 0;
659 case 'R':
660 clearscr();
661 display_file(DATA_EULA, 1);
662 continue;
663 case 'A':
664 db = db_open();
665 if (db == NULL)
666 {
667 ret = -1;
668 goto cleanup;
669 }
670
671 snprintf(sql, sizeof(sql),
672 "UPDATE user_pubinfo SET visit_count = visit_count + 1, "
673 "last_login_dt = NOW() WHERE UID = %d",
674 BBS_priv.uid);
675 if (mysql_query(db, sql) != 0)
676 {
677 log_error("Update user_pubinfo error: %s", mysql_error(db));
678 ret = -1;
679 goto cleanup;
680 }
681
682 mysql_close(db);
683 db = NULL;
684
685 moveto(3, 1);
686 prints("您已接受《用户许可协议》,请重新登陆。");
687 press_any_key();
688 return 1;
689 default:
690 continue;
691 }
692
693 break;
694 }
695
696 cleanup:
697 mysql_close(db);
698
699 return ret;
700 }

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