-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathpool_auth.c
1424 lines (1235 loc) · 32.3 KB
/
pool_auth.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
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* -*-pgsql-c-*- */
/*
* $Header$
*
* pgpool: a language independent connection pool server for PostgreSQL
* written by Tatsuo Ishii
*
* Copyright (c) 2003-2016 PgPool Global Development Group
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation, and that the name of the
* author not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. The author makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* pool_auth.c: authenticaton stuff
*
*/
#include "pool.h"
#include "pool_stream.h"
#include "pool_config.h"
#include "pool_passwd.h"
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_PARAM_H
#include <param.h>
#endif
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#define AUTHFAIL_ERRORCODE "28000"
static POOL_STATUS pool_send_backend_key_data(POOL_CONNECTION *frontend, int pid, int key, int protoMajor);
static int do_clear_text_password(POOL_CONNECTION *backend, POOL_CONNECTION *frontend, int reauth, int protoMajor);
static void pool_send_auth_fail(POOL_CONNECTION *frontend, POOL_CONNECTION_POOL *cp);
static int do_crypt(POOL_CONNECTION *backend, POOL_CONNECTION *frontend, int reauth, int protoMajor);
static int do_md5(POOL_CONNECTION *backend, POOL_CONNECTION *frontend, int reauth, int protoMajor);
static int send_md5auth_request(POOL_CONNECTION *frontend, int protoMajor, char *salt);
static int read_password_packet(POOL_CONNECTION *frontend, int protoMajor, char *password, int *pwdSize);
static int send_password_packet(POOL_CONNECTION *backend, int protoMajor, char *password);
static int send_auth_ok(POOL_CONNECTION *frontend, int protoMajor);
static long PostmasterRandom(void);
/*
* After sending the start up packet to the backend, do the
* authentication against backend. if success return 0 otherwise non
* 0.
*/
int pool_do_auth(POOL_CONNECTION *frontend, POOL_CONNECTION_POOL *cp)
{
signed char kind;
int pid;
int key;
int protoMajor;
int length;
int authkind;
int i;
StartupPacket *sp;
protoMajor = MASTER_CONNECTION(cp)->sp->major;
kind = pool_read_kind(cp);
if (kind < 0)
{
return -1;
}
/* error response? */
if (kind == 'E')
{
/* we assume error response at this stage is likely version
* protocol mismatch (v3 frontend vs. v2 backend). So we throw
* a V2 protocol error response in the hope that v3 frontend
* will negotiate again using v2 protocol.
*/
pool_log("pool_do_auth: maybe protocol version mismatch (current version %d)", protoMajor);
ErrorResponse(frontend, cp);
return -1;
}
else if (kind != 'R')
{
pool_error("pool_do_auth: expect \"R\" got %c", kind);
return -1;
}
/*
* message length (v3 only)
*/
if (protoMajor == PROTO_MAJOR_V3 && pool_read_message_length(cp) < 0)
{
pool_error("Failed to read the authentication packet length. \
This is likely caused by the inconsistency of auth method among DB nodes. \
In this case you can check the previous error messages (hint: length field) \
from pool_read_message_length and recheck the pg_hba.conf settings.");
return -1;
}
/*
* read authentication request kind.
*
* 0: authentication ok
* 1: kerberos v4
* 2: kerberos v5
* 3: clear text password
* 4: crypt password
* 5: md5 password
* 6: scm credential
*
* in replication mode, we only support kind = 0, 3. this is because "salt"
* cannot be replicated.
* in non replication mode, we support kind = 0, 3, 4, 5
*/
authkind = pool_read_int(cp);
if (authkind < 0)
{
pool_error("pool_do_auth: read auth kind failed");
return -1;
}
authkind = ntohl(authkind);
pool_debug("pool_do_auth: auth kind:%d", authkind);
/* trust? */
if (authkind == 0)
{
int msglen;
pool_write(frontend, "R", 1);
if (protoMajor == PROTO_MAJOR_V3)
{
msglen = htonl(8);
pool_write(frontend, &msglen, sizeof(msglen));
}
msglen = htonl(0);
if (pool_write_and_flush(frontend, &msglen, sizeof(msglen)) < 0)
{
return -1;
}
MASTER(cp)->auth_kind = 0;
}
/* clear text password authentication? */
else if (authkind == 3)
{
for (i=0;i<NUM_BACKENDS;i++)
{
if (!VALID_BACKEND(i))
continue;
pool_debug("trying clear text password authentication");
authkind = do_clear_text_password(CONNECTION(cp, i), frontend, 0, protoMajor);
if (authkind < 0)
{
pool_debug("do_clear_text_password failed in slot %d", i);
pool_send_auth_fail(frontend, cp);
return -1;
}
}
}
/* crypt authentication? */
else if (authkind == 4)
{
for (i=0;i<NUM_BACKENDS;i++)
{
if (!VALID_BACKEND(i))
continue;
pool_debug("trying crypt authentication");
authkind = do_crypt(CONNECTION(cp, i), frontend, 0, protoMajor);
if (authkind < 0)
{
pool_debug("do_crypt_text_password failed in slot %d", i);
pool_send_auth_fail(frontend, cp);
return -1;
}
}
}
/* md5 authentication? */
else if (authkind == 5)
{
/* If MD5 auth is not active in pool_hba.conf, it cannot be
* used with other than raw mode.
*/
if (frontend->auth_method != uaMD5 && !RAW_MODE && NUM_BACKENDS > 1)
{
pool_send_error_message(frontend, protoMajor, AUTHFAIL_ERRORCODE,
"MD5 authentication is unsupported in replication, master-slave and parallel modes.",
"",
"check pg_hba.conf",
__FILE__, __LINE__);
return -1;
}
for (i=0;i<NUM_BACKENDS;i++)
{
if (!VALID_BACKEND(i))
continue;
pool_debug("trying md5 authentication");
authkind = do_md5(CONNECTION(cp, i), frontend, 0, protoMajor);
if (authkind < 0)
{
pool_debug("do_md5failed in slot %d", i);
pool_send_auth_fail(frontend, cp);
return -1;
}
}
}
else
{
pool_error("pool_do_auth: unsupported auth kind received: %d", authkind);
return -1;
}
if (authkind != 0)
{
pool_error("pool_do_auth: unknown authentication response from backend %d", authkind);
return -1;
}
/*
* authentication ok. now read pid and secret key from the
* backend
*/
for (;;)
{
char *message;
kind = pool_read_kind(cp);
if (kind < 0)
{
pool_error("pool_do_auth: failed to read kind before BackendKeyData");
return -1;
}
else if (kind == 'K')
break;
if (protoMajor == PROTO_MAJOR_V3)
{
switch (kind)
{
case 'S':
/* process parameter status */
if (ParameterStatus(frontend, cp) != POOL_CONTINUE)
return -1;
pool_flush(frontend);
break;
case 'N':
if (pool_extract_error_message(true, MASTER(cp), protoMajor, true, &message) == 1)
{
pool_log("pool_do_auth: notice message from backend:%s", message);
}
/* process notice message */
if (SimpleForwardToFrontend(kind, frontend, cp))
return -1;
pool_flush(frontend);
break;
/* process error message */
case 'E':
if (pool_extract_error_message(true, MASTER(cp), protoMajor, true, &message) == 1)
{
pool_log("pool_do_auth: error message from backend:%s", message);
}
SimpleForwardToFrontend(kind, frontend, cp);
pool_flush(frontend);
return -1;
break;
default:
pool_error("pool_do_auth: unknown response \"%c\" before processing BackendKeyData",
kind);
return -1;
break;
}
}
else
{
/* V2 case */
switch (kind)
{
case 'N':
/* process notice message */
if (NoticeResponse(frontend, cp) != POOL_CONTINUE)
return -1;
break;
/* process error message */
case 'E':
ErrorResponse(frontend, cp);
return -1;
break;
default:
pool_error("pool_do_auth: unknown response \"%c\" before processing V2 BackendKeyData",
kind);
return -1;
break;
}
}
}
/*
* message length (V3 only)
*/
if (protoMajor == PROTO_MAJOR_V3)
{
if ((length = pool_read_message_length(cp)) != 12)
{
pool_error("pool_do_auth: invalid messages length(%d) for BackendKeyData", length);
return -1;
}
}
/*
* OK, read pid and secret key
*/
sp = MASTER_CONNECTION(cp)->sp;
pid = -1;
for (i=0;i<NUM_BACKENDS;i++)
{
if (VALID_BACKEND(i))
{
/* read pid */
if (pool_read(CONNECTION(cp, i), &pid, sizeof(pid)) < 0)
{
pool_error("pool_do_auth: failed to read pid in slot %d", i);
return -1;
}
pool_debug("pool_do_auth: cp->info[i]:%p pid:%u", &cp->info[i], ntohl(pid));
CONNECTION_SLOT(cp, i)->pid = cp->info[i].pid = pid;
/* read key */
if (pool_read(CONNECTION(cp, i), &key, sizeof(key)) < 0)
{
pool_error("pool_do_auth: failed to read key in slot %d", i);
return -1;
}
CONNECTION_SLOT(cp, i)->key = cp->info[i].key = key;
cp->info[i].major = sp->major;
cp->info[i].minor = sp->minor;
strlcpy(cp->info[i].database, sp->database, sizeof(cp->info[i].database));
strlcpy(cp->info[i].user, sp->user, sizeof(cp->info[i].user));
cp->info[i].counter = 1;
}
}
if (pid == -1)
{
pool_error("pool_do_auth: all backends are down");
return -1;
}
return pool_send_backend_key_data(frontend, pid, key, protoMajor);
}
/*
* do re-authentication for reused connection. if success return 0 otherwise non 0.
*/
int pool_do_reauth(POOL_CONNECTION *frontend, POOL_CONNECTION_POOL *cp)
{
int status;
int protoMajor;
protoMajor = MAJOR(cp);
switch(MASTER(cp)->auth_kind)
{
case 0:
/* trust */
status = 0;
break;
case 3:
/* clear text password */
status = do_clear_text_password(MASTER(cp), frontend, 1, protoMajor);
break;
case 4:
/* crypt password */
status = do_crypt(MASTER(cp), frontend, 1, protoMajor);
break;
case 5:
/* md5 password */
status = do_md5(MASTER(cp), frontend, 1, protoMajor);
break;
default:
pool_error("pool_do_reauth: unknown authentication request code %d",
MASTER(cp)->auth_kind);
return -1;
}
if (status == 0)
{
int msglen;
pool_write(frontend, "R", 1);
if (protoMajor == PROTO_MAJOR_V3)
{
msglen = htonl(8);
pool_write(frontend, &msglen, sizeof(msglen));
}
msglen = htonl(0);
if (pool_write_and_flush(frontend, &msglen, sizeof(msglen)) < 0)
{
return -1;
}
}
else
{
pool_debug("pool_do_reauth: authentication failed");
pool_send_auth_fail(frontend, cp);
return -1;
}
return (pool_send_backend_key_data(frontend, MASTER_CONNECTION(cp)->pid, MASTER_CONNECTION(cp)->key, protoMajor) != POOL_CONTINUE);
}
/*
* send authentication failure message text to frontend
*/
static void pool_send_auth_fail(POOL_CONNECTION *frontend, POOL_CONNECTION_POOL *cp)
{
int messagelen;
char *errmessage;
int protoMajor;
bool send_error_to_frontend = true;
protoMajor = MAJOR(cp);
messagelen = strlen(MASTER_CONNECTION(cp)->sp->user) + 100;
if ((errmessage = (char *)malloc(messagelen+1)) == NULL)
{
pool_error("pool_send_auth_fail_failed: malloc failed: %s", strerror(errno));
child_exit(1);
}
snprintf(errmessage, messagelen, "password authentication failed for user \"%s\"",
MASTER_CONNECTION(cp)->sp->user);
if (send_error_to_frontend)
pool_send_fatal_message(frontend, protoMajor, "XX000", errmessage,
"", "", __FILE__, __LINE__);
free(errmessage);
}
/*
* Send backend key data to frontend. if success return 0 otherwise non 0.
*/
static POOL_STATUS pool_send_backend_key_data(POOL_CONNECTION *frontend, int pid, int key, int protoMajor)
{
char kind;
int len;
/* Send backend key data */
kind = 'K';
pool_write(frontend, &kind, 1);
if (protoMajor == PROTO_MAJOR_V3)
{
len = htonl(12);
pool_write(frontend, &len, sizeof(len));
}
pool_debug("pool_send_auth_ok: send pid %d to frontend", ntohl(pid));
pool_write(frontend, &pid, sizeof(pid));
if (pool_write_and_flush(frontend, &key, sizeof(key)) < 0)
{
return -1;
}
return 0;
}
/*
* perform clear text password authetication
*/
static int do_clear_text_password(POOL_CONNECTION *backend, POOL_CONNECTION *frontend, int reauth, int protoMajor)
{
static int size;
static char password[MAX_PASSWORD_SIZE];
char response;
int kind;
int len;
/* master? */
if (IS_MASTER_NODE_ID(backend->db_node_id))
{
pool_write(frontend, "R", 1); /* authenticaton */
if (protoMajor == PROTO_MAJOR_V3)
{
len = htonl(8);
pool_write(frontend, &len, sizeof(len));
}
kind = htonl(3); /* clear text password authentication */
pool_write_and_flush(frontend, &kind, sizeof(kind)); /* indicating clear text password authentication */
/* read password packet */
if (protoMajor == PROTO_MAJOR_V2)
{
if (pool_read(frontend, &size, sizeof(size)))
{
pool_debug("do_clear_text_password: failed to read password packet size");
return -1;
}
}
else
{
char k;
if (pool_read(frontend, &k, sizeof(k)))
{
pool_debug("do_clear_text_password: failed to read password packet \"p\"");
return -1;
}
if (k != 'p')
{
pool_error("do_clear_text_password: password packet does not start with \"p\"");
return -1;
}
if (pool_read(frontend, &size, sizeof(size)))
{
pool_error("do_clear_text_password: failed to read password packet size");
return -1;
}
}
if ((ntohl(size) - 4) > sizeof(password))
{
pool_error("do_clear_text_password: password is too long (size: %d)", ntohl(size) - 4);
return -1;
}
if (pool_read(frontend, password, ntohl(size) - 4))
{
pool_error("do_clear_text_password: failed to read password (size: %d)", ntohl(size) - 4);
return -1;
}
}
/* connection reusing? */
if (reauth)
{
if ((ntohl(size) - 4) != backend->pwd_size)
{
pool_debug("do_clear_text_password; password size does not match in re-authetication");
return -1;
}
if (memcmp(password, backend->password, backend->pwd_size) != 0)
{
pool_debug("do_clear_text_password; password does not match in re-authetication");
return -1;
}
return 0;
}
/* send password packet to backend */
if (protoMajor == PROTO_MAJOR_V3)
pool_write(backend, "p", 1);
pool_write(backend, &size, sizeof(size));
pool_write_and_flush(backend, password, ntohl(size) -4);
if (pool_read(backend, &response, sizeof(response)))
{
pool_error("do_clear_text_password: failed to read authentication response");
return -1;
}
if (response != 'R')
{
pool_debug("do_clear_text_password: backend does not return R while processing clear text password authentication");
return -1;
}
if (protoMajor == PROTO_MAJOR_V3)
{
if (pool_read(backend, &len, sizeof(len)))
{
pool_error("do_clear_text_password: failed to read authentication packet size");
return -1;
}
if (ntohl(len) != 8)
{
pool_error("do_clear_text_password: incorrect authentication packet size (%d)", ntohl(len));
return -1;
}
}
/* expect to read "Authentication OK" response. kind should be 0... */
if (pool_read(backend, &kind, sizeof(kind)))
{
pool_debug("do_clear_text_password: failed to read Authentication OK response");
return -1;
}
/* if authenticated, save info */
if (!reauth && kind == 0)
{
if (IS_MASTER_NODE_ID(backend->db_node_id))
{
int msglen;
pool_write(frontend, "R", 1);
if (protoMajor == PROTO_MAJOR_V3)
{
msglen = htonl(8);
pool_write(frontend, &msglen, sizeof(msglen));
}
msglen = htonl(0);
if (pool_write_and_flush(frontend, &msglen, sizeof(msglen)) < 0)
{
return -1;
}
}
backend->auth_kind = 3;
backend->pwd_size = ntohl(size) - 4;
memcpy(backend->password, password, backend->pwd_size);
}
return kind;
}
/*
* perform crypt authetication
*/
static int do_crypt(POOL_CONNECTION *backend, POOL_CONNECTION *frontend, int reauth, int protoMajor)
{
char salt[2];
static int size;
static char password[MAX_PASSWORD_SIZE];
char response;
int kind;
int len;
if (!reauth)
{
/* read salt */
if (pool_read(backend, salt, sizeof(salt)))
{
pool_error("do_crypt: failed to read salt");
return -1;
}
}
else
{
memcpy(salt, backend->salt, sizeof(salt));
}
/* master? */
if (IS_MASTER_NODE_ID(backend->db_node_id))
{
pool_write(frontend, "R", 1); /* authenticaton */
if (protoMajor == PROTO_MAJOR_V3)
{
len = htonl(10);
pool_write(frontend, &len, sizeof(len));
}
kind = htonl(4); /* crypt authentication */
pool_write(frontend, &kind, sizeof(kind)); /* indicating crypt authentication */
pool_write_and_flush(frontend, salt, sizeof(salt)); /* salt */
/* read password packet */
if (protoMajor == PROTO_MAJOR_V2)
{
if (pool_read(frontend, &size, sizeof(size)))
{
pool_error("do_crypt: failed to read password packet size");
return -1;
}
}
else
{
char k;
if (pool_read(frontend, &k, sizeof(k)))
{
pool_debug("do_crypt_password: failed to read password packet \"p\"");
return -1;
}
if (k != 'p')
{
pool_error("do_crypt_password: password packet does not start with \"p\"");
return -1;
}
if (pool_read(frontend, &size, sizeof(size)))
{
pool_error("do_crypt_password: failed to read password packet size");
return -1;
}
}
if ((ntohl(size) - 4) > sizeof(password))
{
pool_error("do_crypt: password is too long(size: %d)", ntohl(size) - 4);
return -1;
}
if (pool_read(frontend, password, ntohl(size) - 4))
{
pool_error("do_crypt: failed to read password (size: %d)", ntohl(size) - 4);
return -1;
}
}
/* connection reusing? */
if (reauth)
{
pool_debug("size: %d saved_size: %d", (ntohl(size) - 4), backend->pwd_size);
if ((ntohl(size) - 4) != backend->pwd_size)
{
pool_debug("do_crypt: password size does not match in re-authentication");
return -1;
}
if (memcmp(password, backend->password, backend->pwd_size) != 0)
{
pool_debug("do_crypt: password does not match in re-authentication");
return -1;
}
return 0;
}
/* send password packet to backend */
if (protoMajor == PROTO_MAJOR_V3)
pool_write(backend, "p", 1);
pool_write(backend, &size, sizeof(size));
pool_write_and_flush(backend, password, ntohl(size) -4);
if (pool_read(backend, &response, sizeof(response)))
{
pool_error("do_crypt: failed to read authentication response");
return -1;
}
if (response != 'R')
{
pool_debug("do_crypt: backend does not return R while processing crypt authentication(%02x) DB node id: %d", response, backend->db_node_id);
return -1;
}
if (protoMajor == PROTO_MAJOR_V3)
{
if (pool_read(backend, &len, sizeof(len)))
{
pool_error("do_crypt: failed to read authentication packet size");
return -1;
}
if (ntohl(len) != 8)
{
pool_error("do_crypt: incorrect authentication packet size (%d)", ntohl(len));
return -1;
}
}
/* expect to read "Authentication OK" response. kind should be 0... */
if (pool_read(backend, &kind, sizeof(kind)))
{
pool_debug("do_crypt: failed to read Authentication OK response");
return -1;
}
/* if authenticated, save info */
if (!reauth && kind == 0)
{
int msglen;
pool_write(frontend, "R", 1);
if (protoMajor == PROTO_MAJOR_V3)
{
msglen = htonl(8);
pool_write(frontend, &msglen, sizeof(msglen));
}
msglen = htonl(0);
if (pool_write_and_flush(frontend, &msglen, sizeof(msglen)) < 0)
{
return -1;
}
backend->auth_kind = 4;
backend->pwd_size = ntohl(size) - 4;
memcpy(backend->password, password, backend->pwd_size);
memcpy(backend->salt, salt, sizeof(salt));
}
return kind;
}
/*
* perform MD5 authetication
*/
static int do_md5(POOL_CONNECTION *backend, POOL_CONNECTION *frontend, int reauth, int protoMajor)
{
char salt[4];
static int size;
static char password[MAX_PASSWORD_SIZE];
int kind;
char encbuf[POOL_PASSWD_LEN+1];
char *pool_passwd = NULL;
if (NUM_BACKENDS > 1)
{
/* Read password entry from pool_passwd */
pool_passwd = pool_get_passwd(frontend->username);
if (!pool_passwd)
{
pool_debug("do_md5: %s does not exist in pool_passwd", frontend->username);
return -1;
}
/* master? */
if (IS_MASTER_NODE_ID(backend->db_node_id))
{
/* Send md5 auth request to frontend with my own salt */
pool_random_salt(salt);
if (send_md5auth_request(frontend, protoMajor, salt))
{
pool_error("do_md5: send_md5auth_request failed");
return -1;
}
/* Read password packet */
if (read_password_packet(frontend, protoMajor, password, &size))
{
pool_debug("do_md5: read_password_packet failed");
return -1;
}
/* Check the password using my salt + pool_passwd */
pg_md5_encrypt(pool_passwd+strlen("md5"), salt, sizeof(salt), encbuf);
if (strcmp(password, encbuf))
{
/* Password does not match */
pool_debug("password does not match: frontend:%s pgpool:%s", password, encbuf);
return -1;
}
}
kind = 0;
if (!reauth)
{
/*
* If ok, authenticate against backends using pool_passwd
*/
/* Read salt */
if (pool_read(backend, salt, sizeof(salt)))
{
pool_error("do_md5: failed to read salt");
return -1;
}
pool_debug("DB node id: %d salt: %hhx%hhx%hhx%hhx", backend->db_node_id,
salt[0], salt[1], salt[2], salt[3]);
/* Encrypt password in pool_passwd using the salt */
pg_md5_encrypt(pool_passwd+strlen("md5"), salt, sizeof(salt), encbuf);
/* Send password packet to backend and receive auth response */
kind = send_password_packet(backend, protoMajor, encbuf);
if (kind < 0)
{
return -1;
}
}
if (!reauth && kind == 0)
{
if (IS_MASTER_NODE_ID(backend->db_node_id))
{
/* Send auth ok to frontend */
if (send_auth_ok(frontend, protoMajor) < 0)
{
pool_error("do_md5: send_auth_ok failed");
return -1;
}
}
/* Save the auth info */
backend->auth_kind = 5;
}
return kind;
}
/*
* Followings are NUM_BACKEND == 1 case.
*/
if (!reauth)
{
/* read salt */
if (pool_read(backend, salt, sizeof(salt)))
{
pool_error("do_md5: failed to read salt");
return -1;
}
pool_debug("DB node id: %d salt: %hhx%hhx%hhx%hhx", backend->db_node_id,
salt[0], salt[1], salt[2], salt[3]);
}
else
{
memcpy(salt, backend->salt, sizeof(salt));
}
/* master? */
if (IS_MASTER_NODE_ID(backend->db_node_id))
{
/* Send md5 auth request to frontend */
if (send_md5auth_request(frontend, protoMajor, salt))
{
pool_error("do_md5: send_md5auth_request failed");
return -1;
}
/* Read password packet */
if (read_password_packet(frontend, protoMajor, password, &size))
{
pool_debug("do_md5: read_password_packet failed");
return -1;
}
}
/* connection reusing? */
if (reauth)
{
if (size != backend->pwd_size)
{
pool_debug("do_md5; password size does not match in re-authentication");
return -1;
}
if (memcmp(password, backend->password, backend->pwd_size) != 0)
{
pool_debug("do_md5; password does not match in re-authentication");
return -1;
}
return 0;
}
/* Send password packet to backend and receive auth response */
kind = send_password_packet(backend, protoMajor, password);
if (kind < 0)
{
return -1;
}
/* If authenticated, reply back to frontend and save info */
if (!reauth && kind == 0)
{
if (send_auth_ok(frontend, protoMajor) < 0)
{
pool_error("do_md5: send_auth_ok failed");
return -1;
}
backend->auth_kind = 5;
backend->pwd_size = size;
memcpy(backend->password, password, backend->pwd_size);
memcpy(backend->salt, salt, sizeof(salt));
}
return kind;
}