-
Notifications
You must be signed in to change notification settings - Fork 1.6k
/
sql_acl.cc
15188 lines (13246 loc) · 463 KB
/
sql_acl.cc
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
/* Copyright (c) 2000, 2018, Oracle and/or its affiliates.
Copyright (c) 2009, 2023, MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
/*
The privileges are saved in the following tables:
mysql/user ; super user who are allowed to do almost anything
mysql/host ; host privileges. This is used if host is empty in mysql/db.
mysql/db ; database privileges / user
data in tables is sorted according to how many not-wild-cards there is
in the relevant fields. Empty strings comes last.
*/
#include "mariadb.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_priv.h"
#include "sql_acl.h" // MYSQL_DB_FIELD_COUNT, ACL_ACCESS
#include "sql_base.h" // close_mysql_tables
#include "key.h" // key_copy, key_cmp_if_same, key_restore
#include "sql_show.h" // append_identifier
#include "sql_table.h" // write_bin_log
#include "hash_filo.h"
#include "sql_parse.h" // check_access
#include "sql_view.h" // VIEW_ANY_ACL
#include "records.h" // READ_RECORD, read_record_info,
// init_read_record, end_read_record
#include "rpl_filter.h" // rpl_filter
#include "rpl_rli.h"
#include <m_ctype.h>
#include <stdarg.h>
#include "sp_head.h"
#include "sp.h"
#include "transaction.h"
#include "lock.h" // MYSQL_LOCK_IGNORE_TIMEOUT
#include <sql_common.h>
#include <mysql/plugin_auth.h>
#include <mysql/plugin_password_validation.h>
#include "sql_connect.h"
#include "hostname.h"
#include "sql_db.h"
#include "sql_array.h"
#include "sql_hset.h"
#include "password.h"
#include "sql_plugin_compat.h"
#include "wsrep_mysqld.h"
#define MAX_SCRAMBLE_LENGTH 1024
bool mysql_user_table_is_in_short_password_format= false;
bool using_global_priv_table= true;
// set that from field length in acl_load?
#ifndef NO_EMBEDDED_ACCESS_CHECKS
const uint max_hostname_length= HOSTNAME_LENGTH;
const uint max_dbname_length= NAME_CHAR_LEN;
#endif
const char *safe_vio_type_name(Vio *vio)
{
size_t unused;
#ifdef EMBEDDED_LIBRARY
if (!vio) return "Internal";
#endif
return vio_type_name(vio_type(vio), &unused);
}
#include "sql_acl_getsort.ic"
static LEX_CSTRING native_password_plugin_name= {
STRING_WITH_LEN("mysql_native_password")
};
static LEX_CSTRING old_password_plugin_name= {
STRING_WITH_LEN("mysql_old_password")
};
/// @todo make it configurable
LEX_CSTRING *default_auth_plugin_name= &native_password_plugin_name;
/*
Wildcard host, matches any hostname
*/
LEX_CSTRING host_not_specified= { STRING_WITH_LEN("%") };
/*
Constants, used in the SHOW GRANTS command.
Their actual string values are irrelevant, they're always compared
as pointers to these string constants.
*/
LEX_CSTRING current_user= { STRING_WITH_LEN("*current_user") };
LEX_CSTRING current_role= { STRING_WITH_LEN("*current_role") };
LEX_CSTRING current_user_and_current_role=
{ STRING_WITH_LEN("*current_user_and_current_role") };
LEX_CSTRING none= {STRING_WITH_LEN("NONE") };
LEX_CSTRING public_name= {STRING_WITH_LEN("PUBLIC") };
static plugin_ref old_password_plugin;
static plugin_ref native_password_plugin;
static plugin_ref get_auth_plugin(THD *thd, const LEX_CSTRING &name, bool *locked)
{
if (name.str == native_password_plugin_name.str)
return native_password_plugin;
else if (name.str == old_password_plugin_name.str)
return old_password_plugin;
*locked=true;
return my_plugin_lock_by_name(thd, &name, MYSQL_AUTHENTICATION_PLUGIN);
}
/* Classes */
struct acl_host_and_ip
{
char *hostname;
long ip, ip_mask; // Used with masked ip:s
};
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static bool compare_hostname(const acl_host_and_ip *, const char *, const char *);
static inline bool is_public(const char *l) { return l == public_name.str; }
static inline bool is_public(const LEX_CSTRING *l) { return is_public(l->str); }
static inline bool is_public(const LEX_USER *l) { return is_public(&l->user); }
#else
#define compare_hostname(X,Y,Z) 0
#endif
class ACL_ACCESS {
public:
ulonglong sort;
privilege_t access;
ACL_ACCESS()
:sort(0), access(NO_ACL)
{ }
};
/* ACL_HOST is used if no host is specified */
class ACL_HOST :public ACL_ACCESS
{
public:
acl_host_and_ip host;
char *db;
};
class ACL_USER_BASE :public ACL_ACCESS, public Sql_alloc
{
public:
ACL_USER_BASE()
:flags(0), user(null_clex_str)
{
bzero(&role_grants, sizeof(role_grants));
}
uchar flags; // field used to store various state information
LEX_CSTRING user;
/* list to hold references to granted roles (ACL_ROLE instances) */
DYNAMIC_ARRAY role_grants;
const char *get_username() { return user.str; }
};
class ACL_USER_PARAM
{
public:
ACL_USER_PARAM()
{
bzero(this, sizeof(*this));
}
acl_host_and_ip host;
size_t hostname_length;
USER_RESOURCES user_resource;
enum SSL_type ssl_type;
uint password_errors;
const char *ssl_cipher, *x509_issuer, *x509_subject;
LEX_CSTRING default_rolename;
struct AUTH { LEX_CSTRING plugin, auth_string, salt; } *auth;
uint nauth;
bool account_locked;
bool password_expired;
my_time_t password_last_changed;
longlong password_lifetime;
bool alloc_auth(MEM_ROOT *root, uint n)
{
return !(auth= (AUTH*) alloc_root(root, (nauth= n)*sizeof(AUTH)));
}
};
class ACL_USER :public ACL_USER_BASE,
public ACL_USER_PARAM
{
public:
ACL_USER() = default;
ACL_USER(THD *thd, const LEX_USER &combo,
const Account_options &options,
const privilege_t privileges);
ACL_USER *copy(MEM_ROOT *root)
{
ACL_USER *dst;
AUTH *dauth;
if (!multi_alloc_root(root, &dst, sizeof(ACL_USER),
&dauth, sizeof(AUTH)*nauth, NULL))
return 0;
*dst= *this;
dst->user= safe_lexcstrdup_root(root, user);
dst->ssl_cipher= safe_strdup_root(root, ssl_cipher);
dst->x509_issuer= safe_strdup_root(root, x509_issuer);
dst->x509_subject= safe_strdup_root(root, x509_subject);
dst->auth= dauth;
for (uint i=0; i < nauth; i++, dauth++)
{
if (auth[i].plugin.str == native_password_plugin_name.str ||
auth[i].plugin.str == old_password_plugin_name.str)
dauth->plugin= auth[i].plugin;
else
dauth->plugin= safe_lexcstrdup_root(root, auth[i].plugin);
dauth->auth_string= safe_lexcstrdup_root(root, auth[i].auth_string);
if (auth[i].salt.length == 0)
dauth->salt= auth[i].salt;
else
dauth->salt= safe_lexcstrdup_root(root, auth[i].salt);
}
dst->host.hostname= safe_strdup_root(root, host.hostname);
dst->default_rolename= safe_lexcstrdup_root(root, default_rolename);
bzero(&dst->role_grants, sizeof(role_grants));
return dst;
}
int cmp(const char *user2, const char *host2)
{
CHARSET_INFO *cs= system_charset_info;
int res;
res= strcmp(user.str, user2);
if (!res)
res= my_strcasecmp(cs, host.hostname, host2);
return res;
}
bool eq(const char *user2, const char *host2) { return !cmp(user2, host2); }
bool wild_eq(const char *user2, const char *host2, const char *ip2)
{
if (strcmp(user.str, user2))
return false;
return compare_hostname(&host, host2, ip2 ? ip2 : host2);
}
};
class ACL_ROLE :public ACL_USER_BASE
{
public:
/*
In case of granting a role to a role, the access bits are merged together
via a bit OR operation and placed in the ACL_USER::access field.
When rebuilding role_grants via the rebuild_role_grant function,
the ACL_USER::access field needs to be reset first. The field
initial_role_access holds initial grants, as granted directly to the role
*/
privilege_t initial_role_access;
/*
In subgraph traversal, when we need to traverse only a part of the graph
(e.g. all direct and indirect grantees of a role X), the counter holds the
number of affected neighbour nodes.
See also propagate_role_grants()
*/
uint counter;
DYNAMIC_ARRAY parent_grantee; // array of backlinks to elements granted
ACL_ROLE(ACL_USER *user);
ACL_ROLE(const char *rolename, privilege_t privileges, MEM_ROOT *mem);
};
class ACL_DB :public ACL_ACCESS
{
public:
ACL_DB() :initial_access(NO_ACL) { }
acl_host_and_ip host;
const char *user,*db;
privilege_t initial_access; /* access bits present in the table */
const char *get_username() { return user; }
};
#ifndef DBUG_OFF
/* status variables, only visible in SHOW STATUS after -#d,role_merge_stats */
ulong role_global_merges= 0, role_db_merges= 0, role_table_merges= 0,
role_column_merges= 0, role_routine_merges= 0;
#endif
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static void update_hostname(acl_host_and_ip *host, const char *hostname);
static bool show_proxy_grants (THD *, const char *, const char *,
char *, size_t);
static bool show_role_grants(THD *, const char *,
ACL_USER_BASE *, char *, size_t);
static bool show_default_role(THD *, ACL_USER *, char *, size_t);
static bool show_global_privileges(THD *, ACL_USER_BASE *,
bool, char *, size_t);
static bool show_database_privileges(THD *, const char *, const char *,
char *, size_t);
static bool show_table_and_column_privileges(THD *, const char *, const char *,
char *, size_t);
static int show_routine_grants(THD *, const char *, const char *,
const Sp_handler *sph, char *, int);
static ACL_ROLE *acl_public= NULL;
inline privilege_t public_access()
{
return (acl_public ? acl_public->access : NO_ACL);
}
class Grant_tables;
class User_table;
class Proxies_priv_table;
class ACL_PROXY_USER :public ACL_ACCESS
{
acl_host_and_ip host;
const char *user;
acl_host_and_ip proxied_host;
const char *proxied_user;
bool with_grant;
typedef enum {
MYSQL_PROXIES_PRIV_HOST,
MYSQL_PROXIES_PRIV_USER,
MYSQL_PROXIES_PRIV_PROXIED_HOST,
MYSQL_PROXIES_PRIV_PROXIED_USER,
MYSQL_PROXIES_PRIV_WITH_GRANT,
MYSQL_PROXIES_PRIV_GRANTOR,
MYSQL_PROXIES_PRIV_TIMESTAMP } proxy_table_fields;
public:
ACL_PROXY_USER () = default;
void init(const char *host_arg, const char *user_arg,
const char *proxied_host_arg, const char *proxied_user_arg,
bool with_grant_arg)
{
user= user_arg;
update_hostname (&host, (host_arg && *host_arg) ? host_arg : NULL);
proxied_user= proxied_user_arg;
update_hostname (&proxied_host,
(proxied_host_arg && *proxied_host_arg) ?
proxied_host_arg : NULL);
with_grant= with_grant_arg;
sort= get_magic_sort("huhu", host.hostname, user, proxied_host.hostname,
proxied_user);
}
void init(MEM_ROOT *mem, const char *host_arg, const char *user_arg,
const char *proxied_host_arg, const char *proxied_user_arg,
bool with_grant_arg)
{
init ((host_arg && *host_arg) ? strdup_root (mem, host_arg) : NULL,
strdup_root (mem, user_arg),
(proxied_host_arg && *proxied_host_arg) ?
strdup_root (mem, proxied_host_arg) : NULL,
strdup_root (mem, proxied_user_arg),
with_grant_arg);
}
void init(const Proxies_priv_table& proxies_priv_table, MEM_ROOT *mem);
bool get_with_grant() { return with_grant; }
const char *get_user() { return user; }
const char *get_host() { return host.hostname; }
const char *get_proxied_user() { return proxied_user; }
const char *get_proxied_host() { return proxied_host.hostname; }
void set_user(MEM_ROOT *mem, const char *user_arg)
{
user= *user_arg ? strdup_root(mem, user_arg) : "";
}
void set_host(MEM_ROOT *mem, const char *host_arg)
{
update_hostname(&host, safe_strdup_root(mem, host_arg));
}
bool check_validity()
{
if (opt_skip_name_resolve &&
(hostname_requires_resolving(host.hostname) ||
hostname_requires_resolving(proxied_host.hostname)))
{
sql_print_warning("'proxies_priv' entry '%s@%s %s@%s' "
"ignored in --skip-name-resolve mode.",
proxied_user,
safe_str(proxied_host.hostname), user,
safe_str(host.hostname));
return TRUE;
}
return FALSE;
}
bool matches(const char *host_arg, const char *user_arg, const char *ip_arg,
const char *proxied_user_arg)
{
DBUG_ENTER("ACL_PROXY_USER::matches");
DBUG_PRINT("info", ("compare_hostname(%s,%s,%s) &&"
"compare_hostname(%s,%s,%s) &&"
"wild_compare (%s,%s) &&"
"wild_compare (%s,%s)",
host.hostname, host_arg, ip_arg, proxied_host.hostname,
host_arg, ip_arg, user_arg, user,
proxied_user_arg, proxied_user));
DBUG_RETURN(compare_hostname(&host, host_arg, ip_arg) &&
compare_hostname(&proxied_host, host_arg, ip_arg) &&
(!*user || !strcmp(user_arg, user)) &&
(!*proxied_user || !strcmp(proxied_user_arg, proxied_user)));
}
inline static bool auth_element_equals(const char *a, const char *b)
{
return (a == b || (a != NULL && b != NULL && !strcmp(a,b)));
}
bool pk_equals(ACL_PROXY_USER *grant)
{
DBUG_ENTER("pk_equals");
DBUG_PRINT("info", ("strcmp(%s,%s) &&"
"strcmp(%s,%s) &&"
"wild_compare (%s,%s) &&"
"wild_compare (%s,%s)",
user, grant->user, proxied_user, grant->proxied_user,
host.hostname, grant->host.hostname,
proxied_host.hostname, grant->proxied_host.hostname));
bool res= auth_element_equals(user, grant->user) &&
auth_element_equals(proxied_user, grant->proxied_user) &&
auth_element_equals(host.hostname, grant->host.hostname) &&
auth_element_equals(proxied_host.hostname,
grant->proxied_host.hostname);
DBUG_RETURN(res);
}
bool granted_on(const char *host_arg, const char *user_arg)
{
return (!strcmp(user, user_arg) &&
((!host.hostname && (!host_arg || !host_arg[0])) ||
(host.hostname && host_arg && !strcmp(host.hostname, host_arg))));
}
void print_grant(String *str)
{
str->append(STRING_WITH_LEN("GRANT PROXY ON '"));
str->append(proxied_user, strlen(proxied_user));
str->append(STRING_WITH_LEN("'@'"));
if (proxied_host.hostname)
str->append(proxied_host.hostname, strlen(proxied_host.hostname));
str->append(STRING_WITH_LEN("' TO '"));
str->append(user, strlen(user));
str->append(STRING_WITH_LEN("'@'"));
if (host.hostname)
str->append(host.hostname, strlen(host.hostname));
str->append(STRING_WITH_LEN("'"));
if (with_grant)
str->append(STRING_WITH_LEN(" WITH GRANT OPTION"));
}
void set_data(ACL_PROXY_USER *grant)
{
with_grant= grant->with_grant;
}
static int store_pk(TABLE *table,
const LEX_CSTRING *host,
const LEX_CSTRING *user,
const LEX_CSTRING *proxied_host,
const LEX_CSTRING *proxied_user)
{
DBUG_ENTER("ACL_PROXY_USER::store_pk");
DBUG_PRINT("info", ("host=%s, user=%s, proxied_host=%s, proxied_user=%s",
host->str, user->str,
proxied_host->str, proxied_user->str));
if (table->field[MYSQL_PROXIES_PRIV_HOST]->store(host->str,
host->length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_USER]->store(user->str,
user->length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_PROXIED_HOST]->store(proxied_host->str,
proxied_host->length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_PROXIED_USER]->store(proxied_user->str,
proxied_user->length,
system_charset_info))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
static int store_data_record(TABLE *table,
const LEX_CSTRING *host,
const LEX_CSTRING *user,
const LEX_CSTRING *proxied_host,
const LEX_CSTRING *proxied_user,
bool with_grant,
const char *grantor)
{
DBUG_ENTER("ACL_PROXY_USER::store_pk");
if (store_pk(table, host, user, proxied_host, proxied_user))
DBUG_RETURN(TRUE);
DBUG_PRINT("info", ("with_grant=%s", with_grant ? "TRUE" : "FALSE"));
if (table->field[MYSQL_PROXIES_PRIV_WITH_GRANT]->store(with_grant ? 1 : 0,
TRUE))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_GRANTOR]->store(grantor,
strlen(grantor),
system_charset_info))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
};
#define FIRST_NON_YN_FIELD 26
class acl_entry :public hash_filo_element
{
public:
privilege_t access;
uint16 length;
char key[1]; // Key will be stored here
};
static uchar* acl_entry_get_key(acl_entry *entry, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length=(uint) entry->length;
return (uchar*) entry->key;
}
static uchar* acl_role_get_key(ACL_ROLE *entry, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length=(uint) entry->user.length;
return (uchar*) entry->user.str;
}
struct ROLE_GRANT_PAIR : public Sql_alloc
{
char *u_uname;
char *u_hname;
char *r_uname;
LEX_STRING hashkey;
bool with_admin;
bool init(MEM_ROOT *mem, const char *username, const char *hostname,
const char *rolename, bool with_admin_option);
};
static uchar* acl_role_map_get_key(ROLE_GRANT_PAIR *entry, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length=(uint) entry->hashkey.length;
return (uchar*) entry->hashkey.str;
}
bool ROLE_GRANT_PAIR::init(MEM_ROOT *mem, const char *username,
const char *hostname, const char *rolename,
bool with_admin_option)
{
size_t uname_l = safe_strlen(username);
size_t hname_l = safe_strlen(hostname);
size_t rname_l = safe_strlen(rolename);
/*
Create a buffer that holds all 3 NULL terminated strings in succession
To save memory space, the same buffer is used as the hashkey
*/
size_t bufflen = uname_l + hname_l + rname_l + 3; //add the '\0' aswell
char *buff= (char *)alloc_root(mem, bufflen);
if (!buff)
return true;
/*
Offsets in the buffer for all 3 strings
*/
char *username_pos= buff;
char *hostname_pos= buff + uname_l + 1;
char *rolename_pos= buff + uname_l + hname_l + 2;
if (username) //prevent undefined behaviour
memcpy(username_pos, username, uname_l);
username_pos[uname_l]= '\0'; //#1 string terminator
u_uname= username_pos;
if (hostname) //prevent undefined behaviour
memcpy(hostname_pos, hostname, hname_l);
hostname_pos[hname_l]= '\0'; //#2 string terminator
u_hname= hostname_pos;
if (rolename) //prevent undefined behaviour
memcpy(rolename_pos, rolename, rname_l);
rolename_pos[rname_l]= '\0'; //#3 string terminator
r_uname= rolename_pos;
hashkey.str = buff;
hashkey.length = bufflen;
with_admin= with_admin_option;
return false;
}
#define IP_ADDR_STRLEN (3 + 1 + 3 + 1 + 3 + 1 + 3)
#define ACL_KEY_LENGTH (IP_ADDR_STRLEN + 1 + NAME_LEN + \
1 + USERNAME_LENGTH + 1)
#if defined(HAVE_OPENSSL)
/*
Without SSL the handshake consists of one packet. This packet
has both client capabilities and scrambled password.
With SSL the handshake might consist of two packets. If the first
packet (client capabilities) has CLIENT_SSL flag set, we have to
switch to SSL and read the second packet. The scrambled password
is in the second packet and client_capabilities field will be ignored.
Maybe it is better to accept flags other than CLIENT_SSL from the
second packet?
*/
#define SSL_HANDSHAKE_SIZE 2
#define MIN_HANDSHAKE_SIZE 2
#else
#define MIN_HANDSHAKE_SIZE 6
#endif /* HAVE_OPENSSL && !EMBEDDED_LIBRARY */
#define NORMAL_HANDSHAKE_SIZE 6
#define ROLE_ASSIGN_COLUMN_IDX 44
#define DEFAULT_ROLE_COLUMN_IDX 45
#define MAX_STATEMENT_TIME_COLUMN_IDX 46
/* various flags valid for ACL_USER */
#define IS_ROLE (1L << 0)
/* Flag to mark that a ROLE is on the recursive DEPTH_FIRST_SEARCH stack */
#define ROLE_ON_STACK (1L << 1)
/*
Flag to mark that a ROLE and all it's neighbours have
been visited
*/
#define ROLE_EXPLORED (1L << 2)
/* Flag to mark that on_node was already called for this role */
#define ROLE_OPENED (1L << 3)
static DYNAMIC_ARRAY acl_hosts, acl_users, acl_proxy_users;
static Dynamic_array<ACL_DB> acl_dbs(PSI_INSTRUMENT_MEM, 0, 50);
typedef Dynamic_array<ACL_DB>::CMP_FUNC acl_dbs_cmp;
static HASH acl_roles;
/*
An hash containing mappings user <--> role
A hash is used so as to make updates quickly
The hashkey used represents all the entries combined
*/
static HASH acl_roles_mappings;
static MEM_ROOT acl_memroot, grant_memroot;
static bool initialized=0;
static bool allow_all_hosts=1;
static HASH acl_check_hosts, column_priv_hash, proc_priv_hash, func_priv_hash;
static HASH package_spec_priv_hash, package_body_priv_hash;
static DYNAMIC_ARRAY acl_wild_hosts;
static Hash_filo<acl_entry> *acl_cache;
static uint grant_version=0; /* Version of priv tables. incremented by acl_load */
static privilege_t get_access(TABLE *form, uint fieldnr, uint *next_field=0);
static int acl_compare(const ACL_ACCESS *a, const ACL_ACCESS *b);
static int acl_user_compare(const ACL_USER *a, const ACL_USER *b);
static void rebuild_acl_users();
static int acl_db_compare(const ACL_DB *a, const ACL_DB *b);
static void rebuild_acl_dbs();
static void init_check_host(void);
static void rebuild_check_host(void);
static void rebuild_role_grants(void);
static ACL_USER *find_user_exact(const char *host, const char *user);
static ACL_USER *find_user_wild(const char *host, const char *user, const char *ip= 0);
static ACL_ROLE *find_acl_role(const char *user, bool allow_public);
static ROLE_GRANT_PAIR *find_role_grant_pair(const LEX_CSTRING *u, const LEX_CSTRING *h, const LEX_CSTRING *r);
static ACL_USER_BASE *find_acl_user_base(const char *user, const char *host);
static bool update_user_table_password(THD *, const User_table&, const ACL_USER&);
static bool acl_load(THD *thd, const Grant_tables& grant_tables);
static inline void get_grantor(THD *thd, char* grantor);
static bool add_role_user_mapping(const char *uname, const char *hname, const char *rname);
static bool get_YN_as_bool(Field *field);
#define ROLE_CYCLE_FOUND 2
static int traverse_role_graph_up(ACL_ROLE *, void *,
int (*) (ACL_ROLE *, void *),
int (*) (ACL_ROLE *, ACL_ROLE *, void *));
static int traverse_role_graph_down(ACL_USER_BASE *, void *,
int (*) (ACL_USER_BASE *, void *),
int (*) (ACL_USER_BASE *, ACL_ROLE *, void *));
HASH *Sp_handler_procedure::get_priv_hash() const
{
return &proc_priv_hash;
}
HASH *Sp_handler_function::get_priv_hash() const
{
return &func_priv_hash;
}
HASH *Sp_handler_package_spec::get_priv_hash() const
{
return &package_spec_priv_hash;
}
HASH *Sp_handler_package_body::get_priv_hash() const
{
return &package_body_priv_hash;
}
/*
Enumeration of ACL/GRANT tables in the mysql database
*/
enum enum_acl_tables
{
DB_TABLE,
TABLES_PRIV_TABLE,
COLUMNS_PRIV_TABLE,
#define FIRST_OPTIONAL_TABLE HOST_TABLE
HOST_TABLE,
PROCS_PRIV_TABLE,
PROXIES_PRIV_TABLE,
ROLES_MAPPING_TABLE,
USER_TABLE // <== always the last
};
static const int Table_user= 1 << USER_TABLE;
static const int Table_db= 1 << DB_TABLE;
static const int Table_tables_priv= 1 << TABLES_PRIV_TABLE;
static const int Table_columns_priv= 1 << COLUMNS_PRIV_TABLE;
static const int Table_host= 1 << HOST_TABLE;
static const int Table_procs_priv= 1 << PROCS_PRIV_TABLE;
static const int Table_proxies_priv= 1 << PROXIES_PRIV_TABLE;
static const int Table_roles_mapping= 1 << ROLES_MAPPING_TABLE;
static LEX_CSTRING MYSQL_TABLE_NAME[USER_TABLE+1]= {
{STRING_WITH_LEN("db")},
{STRING_WITH_LEN("tables_priv")},
{STRING_WITH_LEN("columns_priv")},
{STRING_WITH_LEN("host")},
{STRING_WITH_LEN("procs_priv")},
{STRING_WITH_LEN("proxies_priv")},
{STRING_WITH_LEN("roles_mapping")},
{STRING_WITH_LEN("global_priv")}
};
static LEX_CSTRING MYSQL_TABLE_NAME_USER={STRING_WITH_LEN("user")};
/**
Choose from either native or old password plugins when assigning a password
*/
static LEX_CSTRING &guess_auth_plugin(THD *thd, size_t password_len)
{
if (thd->variables.old_passwords == 1 ||
password_len == SCRAMBLED_PASSWORD_CHAR_LENGTH_323)
return old_password_plugin_name;
else
return native_password_plugin_name;
}
/**
Base class representing a generic grant table from the mysql database.
The potential tables that this class can represent are:
user, db, columns_priv, tables_priv, host, procs_priv, proxies_priv,
roles_mapping
Objects belonging to this parent class can only be constructed by the
Grants_table class. This ensures the correct initialization of the objects.
*/
class Grant_table_base
{
public:
/* Number of fields for this Grant Table. */
uint num_fields() const { return m_table->s->fields; }
/* Check if the table exists after an attempt to open it was made.
Some tables, such as the host table in MySQL 5.6.7+ are missing. */
bool table_exists() const { return m_table; };
/* Initializes the READ_RECORD structure provided as a parameter
to read through the whole table, with all columns available. Cleaning up
is the caller's job. */
bool init_read_record(READ_RECORD* info) const
{
DBUG_ASSERT(m_table);
if (num_fields() < min_columns)
{
my_printf_error(ER_UNKNOWN_ERROR, "Fatal error: mysql.%s table is "
"damaged or in unsupported 3.20 format",
MYF(ME_ERROR_LOG), m_table->s->table_name.str);
return 1;
}
bool result= ::init_read_record(info, m_table->in_use, m_table,
NULL, NULL, 1, true, false);
if (!result)
m_table->use_all_columns();
return result;
}
/* Return the underlying TABLE handle. */
TABLE* table() const { return m_table; }
privilege_t get_access() const
{
ulonglong access_bits= 0, bit= 1;
for (uint i = start_priv_columns; i < end_priv_columns; i++, bit<<=1)
{
if (get_YN_as_bool(m_table->field[i]))
access_bits|= bit;
}
return ALL_KNOWN_ACL & access_bits;
}
protected:
friend class Grant_tables;
Grant_table_base() : min_columns(3), start_priv_columns(0), end_priv_columns(0), m_table(0)
{ }
/* Compute how many privilege columns this table has. This method
can only be called after the table has been opened.
IMPLEMENTATION
A privilege column is of type enum('Y', 'N'). Privilege columns are
expected to be one after another.
*/
void set_table(TABLE *table)
{
if (!(m_table= table)) // Table does not exist or not opened.
return;
for (end_priv_columns= 0; end_priv_columns < num_fields(); end_priv_columns++)
{
Field *field= m_table->field[end_priv_columns];
if (field->real_type() == MYSQL_TYPE_ENUM &&
static_cast<Field_enum*>(field)->typelib->count == 2)
{
if (!start_priv_columns)
start_priv_columns= end_priv_columns;
}
else if (start_priv_columns)
break;
}
}
/* the min number of columns a table should have */
uint min_columns;
/* The index at which privilege columns start. */
uint start_priv_columns;
/* The index after the last privilege column */
uint end_priv_columns;
TABLE *m_table;
};
class User_table: public Grant_table_base
{
public:
bool init_read_record(READ_RECORD* info) const
{
return Grant_table_base::init_read_record(info) || setup_sysvars();
}
virtual LEX_CSTRING& name() const = 0;
virtual int get_auth(THD *, MEM_ROOT *, ACL_USER *u) const= 0;
virtual bool set_auth(const ACL_USER &u) const = 0;
virtual privilege_t get_access() const = 0;
virtual void set_access(const privilege_t rights, bool revoke) const = 0;
char *get_host(MEM_ROOT *root) const
{ return ::get_field(root, m_table->field[0]); }
int set_host(const char *s, size_t l) const
{ return m_table->field[0]->store(s, l, system_charset_info); };
char *get_user(MEM_ROOT *root) const
{ return ::get_field(root, m_table->field[1]); }
int set_user(const char *s, size_t l) const
{ return m_table->field[1]->store(s, l, system_charset_info); };
virtual SSL_type get_ssl_type () const = 0;
virtual int set_ssl_type (SSL_type x) const = 0;
virtual const char* get_ssl_cipher (MEM_ROOT *root) const = 0;
virtual int set_ssl_cipher (const char *s, size_t l) const = 0;
virtual const char* get_x509_issuer (MEM_ROOT *root) const = 0;
virtual int set_x509_issuer (const char *s, size_t l) const = 0;
virtual const char* get_x509_subject (MEM_ROOT *root) const = 0;
virtual int set_x509_subject (const char *s, size_t l) const = 0;
virtual longlong get_max_questions () const = 0;
virtual int set_max_questions (longlong x) const = 0;
virtual longlong get_max_updates () const = 0;
virtual int set_max_updates (longlong x) const = 0;
virtual longlong get_max_connections () const = 0;
virtual int set_max_connections (longlong x) const = 0;
virtual longlong get_max_user_connections () const = 0;
virtual int set_max_user_connections (longlong x) const = 0;
virtual double get_max_statement_time () const = 0;
virtual int set_max_statement_time (double x) const = 0;
virtual bool get_is_role () const = 0;
virtual int set_is_role (bool x) const = 0;
virtual const char* get_default_role (MEM_ROOT *root) const = 0;
virtual int set_default_role (const char *s, size_t l) const = 0;
virtual bool get_account_locked () const = 0;
virtual int set_account_locked (bool x) const = 0;
virtual bool get_password_expired () const = 0;
virtual int set_password_expired (bool x) const = 0;
virtual my_time_t get_password_last_changed () const = 0;
virtual int set_password_last_changed (my_time_t x) const = 0;
virtual longlong get_password_lifetime () const = 0;
virtual int set_password_lifetime (longlong x) const = 0;
virtual ~User_table() = default;
private:
friend class Grant_tables;
virtual int setup_sysvars() const = 0;
};
/* MySQL-3.23 to MariaDB 10.3 `user` table */
class User_table_tabular: public User_table
{
public:
LEX_CSTRING& name() const { return MYSQL_TABLE_NAME_USER; }
int get_auth(THD *thd, MEM_ROOT *root, ACL_USER *u) const
{
mysql_mutex_assert_owner(&acl_cache->lock);
u->alloc_auth(root, 1);
if (have_password())
{
const char *as= safe_str(::get_field(&acl_memroot, password()));
u->auth->auth_string.str= as;
u->auth->auth_string.length= strlen(as);
u->auth->plugin= guess_auth_plugin(thd, u->auth->auth_string.length);
}
else
{
u->auth->plugin= native_password_plugin_name;
u->auth->auth_string= empty_clex_str;
}
if (plugin() && authstr())
{
char *tmpstr= ::get_field(&acl_memroot, plugin());
if (tmpstr)
{
const char *pw= u->auth->auth_string.str;
const char *as= safe_str(::get_field(&acl_memroot, authstr()));
if (*pw)
{
if (*as && strcmp(as, pw))
{
sql_print_warning("'user' entry '%s@%s' has both a password and an "
"authentication plugin specified. The password will be ignored.",
safe_str(get_user(thd->mem_root)), safe_str(get_host(thd->mem_root)));
}
else
as= pw;
}
u->auth->plugin.str= tmpstr;
u->auth->plugin.length= strlen(tmpstr);
u->auth->auth_string.str= as;
u->auth->auth_string.length= strlen(as);
}
}
return 0;
}