lib/uid_wrapper/uid_wrapper.c

   1 /*
   2  * Copyright (c) 2009      Andrew Tridgell
   3  * Copyright (c) 2011-2013 Andreas Schneider <asn@samba.org>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "config.h"
  20
  21 #include <errno.h>
  22 #include <stdarg.h>
  23 #include <stdbool.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28 #include <unistd.h>
  29 #include <grp.h>
  30 #ifdef HAVE_SYS_SYSCALL_H
  31 #include <sys/syscall.h>
  32 #endif
  33 #ifdef HAVE_SYSCALL_H
  34 #include <syscall.h>
  35 #endif
  36 #include <dlfcn.h>
  37
  38 #include <pthread.h>
  39
  40 #ifdef HAVE_GCC_THREAD_LOCAL_STORAGE
  41 # define UWRAP_THREAD __thread
  42 #else
  43 # define UWRAP_THREAD
  44 #endif
  45
  46 # define UWRAP_LOCK(m) do { \
  47         pthread_mutex_lock(&( m ## _mutex)); \
  48 } while(0)
  49
  50 # define UWRAP_UNLOCK(m) do { \
  51         pthread_mutex_unlock(&( m ## _mutex)); \
  52 } while(0)
  53
  54 /* Add new global locks here please */
  55 # define UWRAP_LOCK_ALL \
  56         UWRAP_LOCK(uwrap_id); \
  57         UWRAP_LOCK(libc_symbol_binding); \
  58         UWRAP_LOCK(libpthread_symbol_binding)
  59
  60 # define UWRAP_UNLOCK_ALL \
  61         UWRAP_UNLOCK(libpthread_symbol_binding); \
  62         UWRAP_UNLOCK(libc_symbol_binding); \
  63         UWRAP_UNLOCK(uwrap_id)
  64
  65 #ifdef HAVE_CONSTRUCTOR_ATTRIBUTE
  66 #define CONSTRUCTOR_ATTRIBUTE __attribute__ ((constructor))
  67 #else
  68 #define CONSTRUCTOR_ATTRIBUTE
  69 #endif /* HAVE_CONSTRUCTOR_ATTRIBUTE */
  70
  71 #ifdef HAVE_DESTRUCTOR_ATTRIBUTE
  72 #define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor))
  73 #else
  74 #define DESTRUCTOR_ATTRIBUTE
  75 #endif /* HAVE_DESTRUCTOR_ATTRIBUTE */
  76
  77 #ifdef HAVE_ADDRESS_SANITIZER_ATTRIBUTE
  78 #define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE __attribute__((no_sanitize_address))
  79 #else /* DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE */
  80 #define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
  81 #endif /* DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE */
  82
  83 /* GCC have printf type attribute check. */
  84 #ifdef HAVE_FUNCTION_ATTRIBUTE_FORMAT
  85 #define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
  86 #else
  87 #define PRINTF_ATTRIBUTE(a,b)
  88 #endif /* HAVE_FUNCTION_ATTRIBUTE_FORMAT */
  89
  90 #define UWRAP_DLIST_ADD(list,item) do { \
  91         if (!(list)) { \
  92                 (item)->prev    = NULL; \
  93                 (item)->next    = NULL; \
  94                 (list)          = (item); \
  95         } else { \
  96                 (item)->prev    = NULL; \
  97                 (item)->next    = (list); \
  98                 (list)->prev    = (item); \
  99                 (list)          = (item); \
 100         } \
 101 } while (0)
 102
 103 #define UWRAP_DLIST_REMOVE(list,item) do { \
 104         if ((list) == (item)) { \
 105                 (list)          = (item)->next; \
 106                 if (list) { \
 107                         (list)->prev    = NULL; \
 108                 } \
 109         } else { \
 110                 if ((item)->prev) { \
 111                         (item)->prev->next      = (item)->next; \
 112                 } \
 113                 if ((item)->next) { \
 114                         (item)->next->prev      = (item)->prev; \
 115                 } \
 116         } \
 117         (item)->prev    = NULL; \
 118         (item)->next    = NULL; \
 119 } while (0)
 120
 121 #ifndef SAFE_FREE
 122 #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
 123 #endif
 124
 125 /*****************
 126  * LOGGING
 127  *****************/
 128
 129 enum uwrap_dbglvl_e {
 130         UWRAP_LOG_ERROR = 0,
 131         UWRAP_LOG_WARN,
 132         UWRAP_LOG_DEBUG,
 133         UWRAP_LOG_TRACE
 134 };
 135
 136 #ifdef NDEBUG
 137 # define UWRAP_LOG(...)
 138 #else /* NDEBUG */
 139 static void uwrap_log(enum uwrap_dbglvl_e dbglvl, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 140 # define UWRAP_LOG(dbglvl, ...) uwrap_log((dbglvl), __VA_ARGS__)
 141
 142 static void uwrap_log(enum uwrap_dbglvl_e dbglvl, const char *format, ...)
 143 {
 144         char buffer[1024];
 145         va_list va;
 146         const char *d;
 147         unsigned int lvl = 0;
 148
 149         d = getenv("UID_WRAPPER_DEBUGLEVEL");
 150         if (d != NULL) {
 151                 lvl = atoi(d);
 152         }
 153
 154         va_start(va, format);
 155         vsnprintf(buffer, sizeof(buffer), format, va);
 156         va_end(va);
 157
 158         if (lvl >= dbglvl) {
 159                 switch (dbglvl) {
 160                         case UWRAP_LOG_ERROR:
 161                                 fprintf(stderr,
 162                                         "UWRAP_ERROR(%d): %s\n",
 163                                         (int)getpid(), buffer);
 164                                 break;
 165                         case UWRAP_LOG_WARN:
 166                                 fprintf(stderr,
 167                                         "UWRAP_WARN(%d): %s\n",
 168                                         (int)getpid(), buffer);
 169                                 break;
 170                         case UWRAP_LOG_DEBUG:
 171                                 fprintf(stderr,
 172                                         "UWRAP_DEBUG(%d): %s\n",
 173                                         (int)getpid(), buffer);
 174                                 break;
 175                         case UWRAP_LOG_TRACE:
 176                                 fprintf(stderr,
 177                                         "UWRAP_TRACE(%d): %s\n",
 178                                         (int)getpid(), buffer);
 179                                 break;
 180                 }
 181         }
 182 }
 183 #endif /* NDEBUG */
 184
 185 /*****************
 186  * LIBC
 187  *****************/
 188
 189 #define LIBC_NAME "libc.so"
 190
 191 typedef int (*__libc_setuid)(uid_t uid);
 192
 193 typedef uid_t (*__libc_getuid)(void);
 194
 195 #ifdef HAVE_SETEUID
 196 typedef int (*__libc_seteuid)(uid_t euid);
 197 #endif
 198
 199 #ifdef HAVE_SETREUID
 200 typedef int (*__libc_setreuid)(uid_t ruid, uid_t euid);
 201 #endif
 202
 203 #ifdef HAVE_SETRESUID
 204 typedef int (*__libc_setresuid)(uid_t ruid, uid_t euid, uid_t suid);
 205 #endif
 206
 207 #ifdef HAVE_GETRESUID
 208 typedef int (*__libc_getresuid)(uid_t *ruid, uid_t *euid, uid_t *suid);
 209 #endif
 210
 211 typedef uid_t (*__libc_geteuid)(void);
 212
 213 typedef int (*__libc_setgid)(gid_t gid);
 214
 215 typedef gid_t (*__libc_getgid)(void);
 216
 217 #ifdef HAVE_SETEGID
 218 typedef int (*__libc_setegid)(uid_t egid);
 219 #endif
 220
 221 #ifdef HAVE_SETREGID
 222 typedef int (*__libc_setregid)(uid_t rgid, uid_t egid);
 223 #endif
 224
 225 #ifdef HAVE_SETRESGID
 226 typedef int (*__libc_setresgid)(uid_t rgid, uid_t egid, uid_t sgid);
 227 #endif
 228
 229 #ifdef HAVE_GETRESGID
 230 typedef int (*__libc_getresgid)(gid_t *rgid, gid_t *egid, gid_t *sgid);
 231 #endif
 232
 233 typedef gid_t (*__libc_getegid)(void);
 234
 235 typedef int (*__libc_getgroups)(int size, gid_t list[]);
 236
 237 typedef int (*__libc_setgroups)(size_t size, const gid_t *list);
 238
 239 #ifdef HAVE_SYSCALL
 240 typedef long int (*__libc_syscall)(long int sysno, ...);
 241 #endif
 242
 243 #define UWRAP_SYMBOL_ENTRY(i) \
 244         union { \
 245                 __libc_##i f; \
 246                 void *obj; \
 247         } _libc_##i
 248
 249 struct uwrap_libc_symbols {
 250         UWRAP_SYMBOL_ENTRY(setuid);
 251         UWRAP_SYMBOL_ENTRY(getuid);
 252 #ifdef HAVE_SETEUID
 253         UWRAP_SYMBOL_ENTRY(seteuid);
 254 #endif
 255 #ifdef HAVE_SETREUID
 256         UWRAP_SYMBOL_ENTRY(setreuid);
 257 #endif
 258 #ifdef HAVE_SETRESUID
 259         UWRAP_SYMBOL_ENTRY(setresuid);
 260 #endif
 261 #ifdef HAVE_GETRESUID
 262         UWRAP_SYMBOL_ENTRY(getresuid);
 263 #endif
 264         UWRAP_SYMBOL_ENTRY(geteuid);
 265         UWRAP_SYMBOL_ENTRY(setgid);
 266         UWRAP_SYMBOL_ENTRY(getgid);
 267 #ifdef HAVE_SETEGID
 268         UWRAP_SYMBOL_ENTRY(setegid);
 269 #endif
 270 #ifdef HAVE_SETREGID
 271         UWRAP_SYMBOL_ENTRY(setregid);
 272 #endif
 273 #ifdef HAVE_SETRESGID
 274         UWRAP_SYMBOL_ENTRY(setresgid);
 275 #endif
 276 #ifdef HAVE_GETRESGID
 277         UWRAP_SYMBOL_ENTRY(getresgid);
 278 #endif
 279         UWRAP_SYMBOL_ENTRY(getegid);
 280         UWRAP_SYMBOL_ENTRY(getgroups);
 281         UWRAP_SYMBOL_ENTRY(setgroups);
 282 #ifdef HAVE_SYSCALL
 283         UWRAP_SYMBOL_ENTRY(syscall);
 284 #endif
 285 };
 286 #undef UWRAP_SYMBOL_ENTRY
 287
 288 /*****************
 289  * LIBPTHREAD
 290  *****************/
 291 /* Yeah... I'm pig. I overloading macro here... So what? */
 292 #define UWRAP_SYMBOL_ENTRY(i) \
 293         union { \
 294                 __libpthread_##i f; \
 295                 void *obj; \
 296         } _libpthread_##i
 297
 298 typedef int (*__libpthread_pthread_create)(pthread_t *thread,
 299                                     const pthread_attr_t *attr,
 300                                     void *(*start_routine) (void *),
 301                                     void *arg);
 302 typedef void (*__libpthread_pthread_exit)(void *retval);
 303
 304 struct uwrap_libpthread_symbols {
 305         UWRAP_SYMBOL_ENTRY(pthread_create);
 306         UWRAP_SYMBOL_ENTRY(pthread_exit);
 307 };
 308 #undef UWRAP_SYMBOL_ENTRY
 309
 310 /*
 311  * We keep the virtualised euid/egid/groups information here
 312  */
 313 struct uwrap_thread {
 314         bool enabled;
 315
 316         uid_t ruid;
 317         uid_t euid;
 318         uid_t suid;
 319
 320         gid_t rgid;
 321         gid_t egid;
 322         gid_t sgid;
 323
 324         int ngroups;
 325         gid_t *groups;
 326
 327         struct uwrap_thread *next;
 328         struct uwrap_thread *prev;
 329 };
 330
 331 struct uwrap {
 332         struct {
 333                 void *handle;
 334                 struct uwrap_libc_symbols symbols;
 335         } libc;
 336
 337         struct {
 338                 void *handle;
 339                 struct uwrap_libpthread_symbols symbols;
 340         } libpthread;
 341
 342         bool initialised;
 343
 344         /* Real uid and gid of user who run uid wrapper */
 345         uid_t myuid;
 346         gid_t mygid;
 347
 348         struct uwrap_thread *ids;
 349 };
 350
 351 static struct uwrap uwrap;
 352
 353 /* Shortcut to the list item */
 354 static UWRAP_THREAD struct uwrap_thread *uwrap_tls_id;
 355
 356 /* The mutex or accessing the id */
 357 static pthread_mutex_t uwrap_id_mutex = PTHREAD_MUTEX_INITIALIZER;
 358
 359 /* The mutex for accessing the global libc.symbols */
 360 static pthread_mutex_t libc_symbol_binding_mutex = PTHREAD_MUTEX_INITIALIZER;
 361
 362 /* The mutex for accessing the global libpthread.symbols */
 363 static pthread_mutex_t libpthread_symbol_binding_mutex = PTHREAD_MUTEX_INITIALIZER;
 364
 365 /*********************************************************
 366  * UWRAP PROTOTYPES
 367  *********************************************************/
 368
 369 bool uid_wrapper_enabled(void);
 370 void uwrap_constructor(void) CONSTRUCTOR_ATTRIBUTE;
 371 void uwrap_destructor(void) DESTRUCTOR_ATTRIBUTE;
 372
 373 /*********************************************************
 374  * UWRAP LIBC LOADER FUNCTIONS
 375  *********************************************************/
 376
 377 enum uwrap_lib {
 378     UWRAP_LIBC,
 379     UWRAP_LIBNSL,
 380     UWRAP_LIBSOCKET,
 381     UWRAP_LIBPTHREAD,
 382 };
 383
 384 static void *uwrap_load_lib_handle(enum uwrap_lib lib)
 385 {
 386         int flags = RTLD_LAZY;
 387         void *handle = NULL;
 388         int i;
 389
 390 #ifdef RTLD_DEEPBIND
 391         flags |= RTLD_DEEPBIND;
 392 #endif
 393
 394         switch (lib) {
 395         case UWRAP_LIBNSL:
 396                 /* FALL TROUGH */
 397         case UWRAP_LIBSOCKET:
 398                 /* FALL TROUGH */
 399         case UWRAP_LIBC:
 400                 handle = uwrap.libc.handle;
 401                 if (handle == NULL) {
 402                         for (i = 10; i >= 0; i--) {
 403                                 char soname[256] = {0};
 404
 405                                 snprintf(soname, sizeof(soname), "libc.so.%d", i);
 406                                 handle = dlopen(soname, flags);
 407                                 if (handle != NULL) {
 408                                         break;
 409                                 }
 410                         }
 411
 412                         uwrap.libc.handle = handle;
 413                 }
 414                 break;
 415         case UWRAP_LIBPTHREAD:
 416                 handle = uwrap.libpthread.handle;
 417                 if (handle == NULL) {
 418                         handle = dlopen("libpthread.so.0", flags);
 419                         if (handle != NULL) {
 420                                 break;
 421                         }
 422                 }
 423                 break;
 424         }
 425
 426         if (handle == NULL) {
 427 #ifdef RTLD_NEXT
 428                 handle = uwrap.libc.handle = RTLD_NEXT;
 429 #else
 430                 fprintf(stderr,
 431                         "Failed to dlopen library: %s\n",
 432                         dlerror());
 433                 exit(-1);
 434 #endif
 435         }
 436
 437         return handle;
 438 }
 439
 440 static void *_uwrap_bind_symbol(enum uwrap_lib lib, const char *fn_name)
 441 {
 442         void *handle;
 443         void *func;
 444
 445         handle = uwrap_load_lib_handle(lib);
 446
 447         func = dlsym(handle, fn_name);
 448         if (func == NULL) {
 449                 fprintf(stderr,
 450                         "Failed to find %s: %s\n",
 451                         fn_name, dlerror());
 452                 exit(-1);
 453         }
 454
 455         return func;
 456 }
 457
 458 #define uwrap_bind_symbol_libc(sym_name) \
 459         UWRAP_LOCK(libc_symbol_binding); \
 460         if (uwrap.libc.symbols._libc_##sym_name.obj == NULL) { \
 461                 uwrap.libc.symbols._libc_##sym_name.obj = \
 462                         _uwrap_bind_symbol(UWRAP_LIBC, #sym_name); \
 463         } \
 464         UWRAP_UNLOCK(libc_symbol_binding)
 465
 466 #define uwrap_bind_symbol_libpthread(sym_name) \
 467         UWRAP_LOCK(libpthread_symbol_binding); \
 468         if (uwrap.libpthread.symbols._libpthread_##sym_name.obj == NULL) { \
 469                 uwrap.libpthread.symbols._libpthread_##sym_name.obj = \
 470                         _uwrap_bind_symbol(UWRAP_LIBPTHREAD, #sym_name); \
 471         } \
 472         UWRAP_UNLOCK(libpthread_symbol_binding)
 473
 474 /*
 475  * IMPORTANT
 476  *
 477  * Functions expeciall from libc need to be loaded individually, you can't load
 478  * all at once or gdb will segfault at startup. The same applies to valgrind and
 479  * has probably something todo with with the linker.
 480  * So we need load each function at the point it is called the first time.
 481  */
 482 static int libc_setuid(uid_t uid)
 483 {
 484         uwrap_bind_symbol_libc(setuid);
 485
 486         return uwrap.libc.symbols._libc_setuid.f(uid);
 487 }
 488
 489 static uid_t libc_getuid(void)
 490 {
 491         uwrap_bind_symbol_libc(getuid);
 492
 493         return uwrap.libc.symbols._libc_getuid.f();
 494 }
 495
 496 #ifdef HAVE_SETEUID
 497 static int libc_seteuid(uid_t euid)
 498 {
 499         uwrap_bind_symbol_libc(seteuid);
 500
 501         return uwrap.libc.symbols._libc_seteuid.f(euid);
 502 }
 503 #endif
 504
 505 #ifdef HAVE_SETREUID
 506 static int libc_setreuid(uid_t ruid, uid_t euid)
 507 {
 508         uwrap_bind_symbol_libc(setreuid);
 509
 510         return uwrap.libc.symbols._libc_setreuid.f(ruid, euid);
 511 }
 512 #endif
 513
 514 #ifdef HAVE_SETRESUID
 515 static int libc_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 516 {
 517         uwrap_bind_symbol_libc(setresuid);
 518
 519         return uwrap.libc.symbols._libc_setresuid.f(ruid, euid, suid);
 520 }
 521 #endif
 522
 523 #ifdef HAVE_GETRESUID
 524 static int libc_getresuid(uid_t *ruid, uid_t *euid, uid_t *suid)
 525 {
 526         uwrap_bind_symbol_libc(getresuid);
 527
 528         return uwrap.libc.symbols._libc_getresuid.f(ruid, euid, suid);
 529 }
 530 #endif
 531
 532 static uid_t libc_geteuid(void)
 533 {
 534         uwrap_bind_symbol_libc(geteuid);
 535
 536         return uwrap.libc.symbols._libc_geteuid.f();
 537 }
 538
 539 static int libc_setgid(gid_t gid)
 540 {
 541         uwrap_bind_symbol_libc(setgid);
 542
 543         return uwrap.libc.symbols._libc_setgid.f(gid);
 544 }
 545
 546 static gid_t libc_getgid(void)
 547 {
 548         uwrap_bind_symbol_libc(getgid);
 549
 550         return uwrap.libc.symbols._libc_getgid.f();
 551 }
 552
 553 #ifdef HAVE_SETEGID
 554 static int libc_setegid(gid_t egid)
 555 {
 556         uwrap_bind_symbol_libc(setegid);
 557
 558         return uwrap.libc.symbols._libc_setegid.f(egid);
 559 }
 560 #endif
 561
 562 #ifdef HAVE_SETREGID
 563 static int libc_setregid(gid_t rgid, gid_t egid)
 564 {
 565         uwrap_bind_symbol_libc(setregid);
 566
 567         return uwrap.libc.symbols._libc_setregid.f(rgid, egid);
 568 }
 569 #endif
 570
 571 #ifdef HAVE_SETRESGID
 572 static int libc_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 573 {
 574         uwrap_bind_symbol_libc(setresgid);
 575
 576         return uwrap.libc.symbols._libc_setresgid.f(rgid, egid, sgid);
 577 }
 578 #endif
 579
 580 #ifdef HAVE_GETRESGID
 581 static int libc_getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid)
 582 {
 583         uwrap_bind_symbol_libc(setresgid);
 584
 585         return uwrap.libc.symbols._libc_getresgid.f(rgid, egid, sgid);
 586 }
 587 #endif
 588
 589 static gid_t libc_getegid(void)
 590 {
 591         uwrap_bind_symbol_libc(getegid);
 592
 593         return uwrap.libc.symbols._libc_getegid.f();
 594 }
 595
 596 static int libc_getgroups(int size, gid_t list[])
 597 {
 598         uwrap_bind_symbol_libc(getgroups);
 599
 600         return uwrap.libc.symbols._libc_getgroups.f(size, list);
 601 }
 602
 603 static int libc_setgroups(size_t size, const gid_t *list)
 604 {
 605         uwrap_bind_symbol_libc(setgroups);
 606
 607         return uwrap.libc.symbols._libc_setgroups.f(size, list);
 608 }
 609
 610 #ifdef HAVE_SYSCALL
 611 DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
 612 static long int libc_vsyscall(long int sysno, va_list va)
 613 {
 614         long int args[8];
 615         long int rc;
 616         int i;
 617
 618         uwrap_bind_symbol_libc(syscall);
 619
 620         for (i = 0; i < 8; i++) {
 621                 args[i] = va_arg(va, long int);
 622         }
 623
 624         rc = uwrap.libc.symbols._libc_syscall.f(sysno,
 625                                           args[0],
 626                                           args[1],
 627                                           args[2],
 628                                           args[3],
 629                                           args[4],
 630                                           args[5],
 631                                           args[6],
 632                                           args[7]);
 633
 634         return rc;
 635 }
 636 #endif
 637
 638 /*
 639  * This part is "optimistic".
 640  * Thread can ends without pthread_exit call.
 641  */
 642 static void libpthread_pthread_exit(void *retval)
 643 {
 644         uwrap_bind_symbol_libpthread(pthread_exit);
 645
 646         uwrap.libpthread.symbols._libpthread_pthread_exit.f(retval);
 647 }
 648
 649 static void uwrap_pthread_exit(void *retval)
 650 {
 651         struct uwrap_thread *id = uwrap_tls_id;
 652
 653         UWRAP_LOG(UWRAP_LOG_DEBUG, "Cleanup thread");
 654
 655         UWRAP_LOCK(uwrap_id);
 656         if (id == NULL) {
 657                 UWRAP_UNLOCK(uwrap_id);
 658                 libpthread_pthread_exit(retval);
 659                 return;
 660         }
 661
 662         UWRAP_DLIST_REMOVE(uwrap.ids, id);
 663         SAFE_FREE(id->groups);
 664         SAFE_FREE(id);
 665         uwrap_tls_id = NULL;
 666
 667         UWRAP_UNLOCK(uwrap_id);
 668
 669         libpthread_pthread_exit(retval);
 670 }
 671
 672 void pthread_exit(void *retval)
 673 {
 674         if (!uid_wrapper_enabled()) {
 675                 libpthread_pthread_exit(retval);
 676         };
 677
 678         uwrap_pthread_exit(retval);
 679
 680         /* Calm down gcc warning. */
 681         exit(666);
 682 }
 683
 684 static int libpthread_pthread_create(pthread_t *thread,
 685                                 const pthread_attr_t *attr,
 686                                 void *(*start_routine) (void *),
 687                                 void *arg)
 688 {
 689         uwrap_bind_symbol_libpthread(pthread_create);
 690         return uwrap.libpthread.symbols._libpthread_pthread_create.f(thread,
 691                                                                      attr,
 692                                                                      start_routine,
 693                                                                      arg);
 694 }
 695
 696 struct uwrap_pthread_create_args {
 697         struct uwrap_thread *id;
 698         void *(*start_routine) (void *);
 699         void *arg;
 700 };
 701
 702 static void *uwrap_pthread_create_start(void *_a)
 703 {
 704         struct uwrap_pthread_create_args *a =
 705                 (struct uwrap_pthread_create_args *)_a;
 706         void *(*start_routine) (void *) = a->start_routine;
 707         void *arg = a->arg;
 708         struct uwrap_thread *id = a->id;
 709
 710         SAFE_FREE(a);
 711
 712         uwrap_tls_id = id;
 713
 714         return start_routine(arg);
 715 }
 716
 717 static int uwrap_pthread_create(pthread_t *thread,
 718                                  const pthread_attr_t *attr,
 719                                  void *(*start_routine) (void *),
 720                                  void *arg)
 721 {
 722         struct uwrap_pthread_create_args *args;
 723         struct uwrap_thread *src_id = uwrap_tls_id;
 724         int ret;
 725
 726         args = malloc(sizeof(struct uwrap_pthread_create_args));
 727         if (args == NULL) {
 728                 UWRAP_LOG(UWRAP_LOG_ERROR,
 729                           "uwrap_pthread_create: Unable to allocate memory");
 730                 errno = ENOMEM;
 731                 return -1;
 732         }
 733         args->start_routine = start_routine;
 734         args->arg = arg;
 735
 736         args->id = calloc(1, sizeof(struct uwrap_thread));
 737         if (args->id == NULL) {
 738                 SAFE_FREE(args);
 739                 UWRAP_LOG(UWRAP_LOG_ERROR,
 740                           "uwrap_pthread_create: Unable to allocate memory");
 741                 errno = ENOMEM;
 742                 return -1;
 743         }
 744
 745         UWRAP_LOCK(uwrap_id);
 746
 747         args->id->groups = malloc(sizeof(gid_t) * src_id->ngroups);
 748         if (args->id->groups == NULL) {
 749                 UWRAP_UNLOCK(uwrap_id);
 750                 SAFE_FREE(args->id);
 751                 SAFE_FREE(args);
 752                 UWRAP_LOG(UWRAP_LOG_ERROR,
 753                           "uwrap_pthread_create: Unable to allocate memory again");
 754                 errno = ENOMEM;
 755                 return -1;
 756         }
 757
 758         args->id->ruid = src_id->ruid;
 759         args->id->euid = src_id->euid;
 760         args->id->suid = src_id->suid;
 761
 762         args->id->rgid = src_id->rgid;
 763         args->id->egid = src_id->egid;
 764         args->id->sgid = src_id->sgid;
 765
 766         args->id->enabled = src_id->enabled;
 767
 768         args->id->ngroups = src_id->ngroups;
 769         if (src_id->groups != NULL) {
 770                 memcpy(args->id->groups, src_id->groups,
 771                        sizeof(gid_t) * src_id->ngroups);
 772         } else {
 773                 SAFE_FREE(args->id->groups);
 774         }
 775
 776         UWRAP_DLIST_ADD(uwrap.ids, args->id);
 777         UWRAP_UNLOCK(uwrap_id);
 778
 779         ret = libpthread_pthread_create(thread, attr,
 780                                         uwrap_pthread_create_start,
 781                                         args);
 782         if (ret != 0) {
 783                 return ret;
 784         }
 785
 786         return ret;
 787 }
 788
 789 int pthread_create(pthread_t *thread,
 790                     const pthread_attr_t *attr,
 791                     void *(*start_routine) (void *),
 792                     void *arg)
 793 {
 794         if (!uid_wrapper_enabled()) {
 795                 return libpthread_pthread_create(thread,
 796                                            attr,
 797                                            start_routine,
 798                                            arg);
 799         };
 800
 801         return uwrap_pthread_create(thread,
 802                                     attr,
 803                                     start_routine,
 804                                     arg);
 805 }
 806
 807 /*********************************************************
 808  * UWRAP ID HANDLING
 809  *********************************************************/
 810
 811 static void uwrap_thread_prepare(void)
 812 {
 813         struct uwrap_thread *id = uwrap_tls_id;
 814
 815         UWRAP_LOCK_ALL;
 816
 817         /*
 818          * What happens if another atfork prepare functions calls a uwrap
 819          * function? So disable it in case another atfork prepare function
 820          * calls a (s)uid function. We disable uid_wrapper only for thread
 821          * (process) which called fork.
 822          */
 823         id->enabled = false;
 824 }
 825
 826 static void uwrap_thread_parent(void)
 827 {
 828         struct uwrap_thread *id = uwrap_tls_id;
 829         id->enabled = true;
 830
 831         UWRAP_UNLOCK_ALL;
 832 }
 833
 834 static void uwrap_thread_child(void)
 835 {
 836         struct uwrap_thread *id = uwrap_tls_id;
 837         struct uwrap_thread *u = uwrap.ids;
 838
 839         /*
 840          * "Garbage collector" - Inspired by DESTRUCTOR.
 841          * All threads (except one which called fork()) are dead now.. Dave
 842          * That's what posix said...
 843          */
 844         while (u != NULL) {
 845                 if (u == id) {
 846                         /* Skip this item. */
 847                         u = uwrap.ids->next;
 848                         continue;
 849                 }
 850
 851                 UWRAP_DLIST_REMOVE(uwrap.ids, u);
 852
 853                 SAFE_FREE(u->groups);
 854                 SAFE_FREE(u);
 855
 856                 u = uwrap.ids;
 857         }
 858
 859         id->enabled = true;
 860
 861         UWRAP_UNLOCK_ALL;
 862 }
 863
 864 static void uwrap_init(void)
 865 {
 866         const char *env;
 867
 868         UWRAP_LOCK(uwrap_id);
 869
 870         if (uwrap.initialised) {
 871                 struct uwrap_thread *id = uwrap_tls_id;
 872
 873                 if (uwrap.ids == NULL) {
 874                         UWRAP_UNLOCK(uwrap_id);
 875                         return;
 876                 }
 877
 878                 if (id == NULL) {
 879                         UWRAP_LOG(UWRAP_LOG_ERROR,
 880                                   "Invalid id for thread");
 881                         exit(-1);
 882                 }
 883
 884                 UWRAP_UNLOCK(uwrap_id);
 885                 return;
 886         }
 887
 888         UWRAP_LOG(UWRAP_LOG_DEBUG, "Initialize uid_wrapper");
 889
 890         uwrap.initialised = true;
 891
 892         env = getenv("UID_WRAPPER");
 893         if (env != NULL && env[0] == '1') {
 894                 const char *root = getenv("UID_WRAPPER_ROOT");
 895                 struct uwrap_thread *id;
 896
 897                 id = calloc(1, sizeof(struct uwrap_thread));
 898                 if (id == NULL) {
 899                         UWRAP_LOG(UWRAP_LOG_ERROR,
 900                                   "Unable to allocate memory for main id");
 901                         exit(-1);
 902                 }
 903
 904                 UWRAP_DLIST_ADD(uwrap.ids, id);
 905                 uwrap_tls_id = id;
 906
 907                 uwrap.myuid = libc_geteuid();
 908                 uwrap.mygid = libc_getegid();
 909
 910                 /* put us in one group */
 911                 if (root != NULL && root[0] == '1') {
 912                         id->ruid = id->euid = id->suid = 0;
 913                         id->rgid = id->egid = id->sgid = 0;
 914
 915                         id->groups = malloc(sizeof(gid_t) * 1);
 916                         if (id->groups == NULL) {
 917                                 UWRAP_LOG(UWRAP_LOG_ERROR,
 918                                           "Unable to allocate memory");
 919                                 exit(-1);
 920                         }
 921
 922                         id->ngroups = 1;
 923                         id->groups[0] = 0;
 924
 925                 } else {
 926                         id->ruid = id->euid = id->suid = uwrap.myuid;
 927                         id->rgid = id->egid = id->sgid = uwrap.mygid;
 928
 929                         id->ngroups = libc_getgroups(0, NULL);
 930                         if (id->ngroups == -1) {
 931                                 UWRAP_LOG(UWRAP_LOG_ERROR,
 932                                           "Unable to call libc_getgroups in uwrap_init.");
 933                                 exit(-1);
 934                         }
 935                         id->groups = malloc(sizeof(gid_t) * id->ngroups);
 936                         if (id->groups == NULL) {
 937                                 UWRAP_LOG(UWRAP_LOG_ERROR, "Unable to allocate memory");
 938                                 exit(-1);
 939                         }
 940                         if (libc_getgroups(id->ngroups, id->groups) == -1) {
 941                                 UWRAP_LOG(UWRAP_LOG_ERROR,
 942                                           "Unable to call libc_getgroups again in uwrap_init.");
 943                                 id->groups = 0;
 944                                 /*
 945                                  * Deallocation of uwrap.groups is handled by
 946                                  * library destructor.
 947                                  */
 948                                 exit(-1);
 949                         }
 950                 }
 951
 952                 id->enabled = true;
 953
 954                 UWRAP_LOG(UWRAP_LOG_DEBUG,
 955                           "Enabled uid_wrapper as %s",
 956                           uwrap.myuid == 0 ? "root" : "user");
 957         }
 958
 959         UWRAP_UNLOCK(uwrap_id);
 960
 961         UWRAP_LOG(UWRAP_LOG_DEBUG, "Succeccfully initialized uid_wrapper");
 962 }
 963
 964 bool uid_wrapper_enabled(void)
 965 {
 966         struct uwrap_thread *id = uwrap_tls_id;
 967         bool enabled;
 968
 969         if (id == NULL) {
 970                 return false;
 971         }
 972
 973         UWRAP_LOCK(uwrap_id);
 974         enabled = id->enabled;
 975         UWRAP_UNLOCK(uwrap_id);
 976
 977         return enabled;
 978 }
 979
 980 #ifdef HAVE_GETRESUID
 981 static int uwrap_getresuid(uid_t *ruid, uid_t *euid, uid_t *suid)
 982 {
 983         struct uwrap_thread *id = uwrap_tls_id;
 984
 985         UWRAP_LOCK(uwrap_id);
 986
 987         *ruid = id->ruid;
 988         *euid = id->euid;
 989         *suid = id->suid;
 990
 991         UWRAP_UNLOCK(uwrap_id);
 992
 993         return 0;
 994 }
 995 #endif
 996
 997 static int uwrap_setresuid_thread(uid_t ruid, uid_t euid, uid_t suid)
 998 {
 999         struct uwrap_thread *id = uwrap_tls_id;
1000
1001         if (ruid == (uid_t)-1 && euid == (uid_t)-1 && suid == (uid_t)-1) {
1002                 errno = EINVAL;
1003                 return -1;
1004         }
1005
1006         UWRAP_LOCK(uwrap_id);
1007         if (ruid != (uid_t)-1) {
1008                 id->ruid = ruid;
1009         }
1010
1011         if (euid != (uid_t)-1) {
1012                 id->euid = euid;
1013         }
1014
1015         if (suid != (uid_t)-1) {
1016                 id->suid = suid;
1017         }
1018
1019         UWRAP_UNLOCK(uwrap_id);
1020
1021         return 0;
1022 }
1023
1024 #ifdef HAVE_GETRESGID
1025 static int uwrap_getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid)
1026 {
1027         struct uwrap_thread *id = uwrap_tls_id;
1028
1029         UWRAP_LOCK(uwrap_id);
1030
1031         *rgid = id->rgid;
1032         *egid = id->egid;
1033         *sgid = id->sgid;
1034
1035         UWRAP_UNLOCK(uwrap_id);
1036
1037         return 0;
1038 }
1039 #endif
1040
1041 static int uwrap_setresuid(uid_t ruid, uid_t euid, uid_t suid)
1042 {
1043         struct uwrap_thread *id;
1044
1045         if (ruid == (uid_t)-1 && euid == (uid_t)-1 && suid == (uid_t)-1) {
1046                 errno = EINVAL;
1047                 return -1;
1048         }
1049
1050         UWRAP_LOCK(uwrap_id);
1051         for (id = uwrap.ids; id; id = id->next) {
1052                 if (ruid != (uid_t)-1) {
1053                         id->ruid = ruid;
1054                 }
1055
1056                 if (euid != (uid_t)-1) {
1057                         id->euid = euid;
1058                 }
1059
1060                 if (suid != (uid_t)-1) {
1061                         id->suid = suid;
1062                 }
1063         }
1064
1065         UWRAP_UNLOCK(uwrap_id);
1066
1067         return 0;
1068 }
1069
1070 /*
1071  * SETUID
1072  */
1073 int setuid(uid_t uid)
1074 {
1075         if (!uid_wrapper_enabled()) {
1076                 return libc_setuid(uid);
1077         }
1078
1079         uwrap_init();
1080         return uwrap_setresuid(uid, -1, -1);
1081 }
1082
1083 #ifdef HAVE_SETEUID
1084 int seteuid(uid_t euid)
1085 {
1086         if (euid == (uid_t)-1) {
1087                 errno = EINVAL;
1088                 return -1;
1089         }
1090
1091         if (!uid_wrapper_enabled()) {
1092                 return libc_seteuid(euid);
1093         }
1094
1095         uwrap_init();
1096         return uwrap_setresuid(-1, euid, -1);
1097 }
1098 #endif
1099
1100 #ifdef HAVE_SETREUID
1101 int setreuid(uid_t ruid, uid_t euid)
1102 {
1103         if (ruid == (uid_t)-1 && euid == (uid_t)-1) {
1104                 errno = EINVAL;
1105                 return -1;
1106         }
1107
1108         if (!uid_wrapper_enabled()) {
1109                 return libc_setreuid(ruid, euid);
1110         }
1111
1112         uwrap_init();
1113         return uwrap_setresuid(ruid, euid, -1);
1114 }
1115 #endif
1116
1117 #ifdef HAVE_SETRESUID
1118 int setresuid(uid_t ruid, uid_t euid, uid_t suid)
1119 {
1120         if (!uid_wrapper_enabled()) {
1121                 return libc_setresuid(ruid, euid, suid);
1122         }
1123
1124         uwrap_init();
1125         return uwrap_setresuid(ruid, euid, suid);
1126 }
1127 #endif
1128
1129 #ifdef HAVE_GETRESUID
1130 int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid)
1131 {
1132         if (!uid_wrapper_enabled()) {
1133                 return libc_getresuid(ruid, euid, suid);
1134         }
1135
1136         uwrap_init();
1137         return uwrap_getresuid(ruid, euid, suid);
1138 }
1139 #endif
1140
1141 /*
1142  * GETUID
1143  */
1144 static uid_t uwrap_getuid(void)
1145 {
1146         struct uwrap_thread *id = uwrap_tls_id;
1147         uid_t uid;
1148
1149         UWRAP_LOCK(uwrap_id);
1150         uid = id->ruid;
1151         UWRAP_UNLOCK(uwrap_id);
1152
1153         return uid;
1154 }
1155
1156 uid_t getuid(void)
1157 {
1158         if (!uid_wrapper_enabled()) {
1159                 return libc_getuid();
1160         }
1161
1162         uwrap_init();
1163         return uwrap_getuid();
1164 }
1165
1166 /*
1167  * GETEUID
1168  */
1169 static uid_t uwrap_geteuid(void)
1170 {
1171         const char *env = getenv("UID_WRAPPER_MYUID");
1172         struct uwrap_thread *id = uwrap_tls_id;
1173         uid_t uid;
1174
1175         UWRAP_LOCK(uwrap_id);
1176         uid = id->euid;
1177         UWRAP_UNLOCK(uwrap_id);
1178
1179         /* Disable root and return myuid */
1180         if (env != NULL && env[0] == '1') {
1181                 uid = uwrap.myuid;
1182         }
1183
1184         return uid;
1185 }
1186
1187 uid_t geteuid(void)
1188 {
1189         if (!uid_wrapper_enabled()) {
1190                 return libc_geteuid();
1191         }
1192
1193         uwrap_init();
1194         return uwrap_geteuid();
1195 }
1196
1197 static int uwrap_setresgid_thread(gid_t rgid, gid_t egid, gid_t sgid)
1198 {
1199         struct uwrap_thread *id = uwrap_tls_id;
1200
1201         if (rgid == (gid_t)-1 && egid == (gid_t)-1 && sgid == (gid_t)-1) {
1202                 errno = EINVAL;
1203                 return -1;
1204         }
1205
1206         UWRAP_LOCK(uwrap_id);
1207         if (rgid != (gid_t)-1) {
1208                 id->rgid = rgid;
1209         }
1210
1211         if (egid != (gid_t)-1) {
1212                 id->egid = egid;
1213         }
1214
1215         if (sgid != (gid_t)-1) {
1216                 id->sgid = sgid;
1217         }
1218
1219         UWRAP_UNLOCK(uwrap_id);
1220
1221         return 0;
1222 }
1223
1224 static int uwrap_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
1225 {
1226         struct uwrap_thread *id;
1227
1228         if (rgid == (gid_t)-1 && egid == (gid_t)-1 && sgid == (gid_t)-1) {
1229                 errno = EINVAL;
1230                 return -1;
1231         }
1232
1233         UWRAP_LOCK(uwrap_id);
1234         for (id = uwrap.ids; id; id = id->next) {
1235                 if (rgid != (gid_t)-1) {
1236                         id->rgid = rgid;
1237                 }
1238
1239                 if (egid != (gid_t)-1) {
1240                         id->egid = egid;
1241                 }
1242
1243                 if (sgid != (gid_t)-1) {
1244                         id->sgid = sgid;
1245                 }
1246         }
1247         UWRAP_UNLOCK(uwrap_id);
1248
1249         return 0;
1250 }
1251
1252 /*
1253  * SETGID
1254  */
1255 int setgid(gid_t gid)
1256 {
1257         if (!uid_wrapper_enabled()) {
1258                 return libc_setgid(gid);
1259         }
1260
1261         uwrap_init();
1262         return uwrap_setresgid(gid, -1, -1);
1263 }
1264
1265 #ifdef HAVE_SETEGID
1266 int setegid(gid_t egid)
1267 {
1268         if (!uid_wrapper_enabled()) {
1269                 return libc_setegid(egid);
1270         }
1271
1272         uwrap_init();
1273         return uwrap_setresgid(-1, egid, -1);
1274 }
1275 #endif
1276
1277 #ifdef HAVE_SETREGID
1278 int setregid(gid_t rgid, gid_t egid)
1279 {
1280         if (!uid_wrapper_enabled()) {
1281                 return libc_setregid(rgid, egid);
1282         }
1283
1284         uwrap_init();
1285         return uwrap_setresgid(rgid, egid, -1);
1286 }
1287 #endif
1288
1289 #ifdef HAVE_SETRESGID
1290 int setresgid(gid_t rgid, gid_t egid, gid_t sgid)
1291 {
1292         if (!uid_wrapper_enabled()) {
1293                 return libc_setresgid(rgid, egid, sgid);
1294         }
1295
1296         uwrap_init();
1297         return uwrap_setresgid(rgid, egid, sgid);
1298 }
1299 #endif
1300
1301 #ifdef HAVE_GETRESGID
1302 int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid)
1303 {
1304         if (!uid_wrapper_enabled()) {
1305                 return libc_getresgid(rgid, egid, sgid);
1306         }
1307
1308         uwrap_init();
1309         return uwrap_getresgid(rgid, egid, sgid);
1310 }
1311 #endif
1312
1313 /*
1314  * GETGID
1315  */
1316 static gid_t uwrap_getgid(void)
1317 {
1318         struct uwrap_thread *id = uwrap_tls_id;
1319         gid_t gid;
1320
1321         UWRAP_LOCK(uwrap_id);
1322         gid = id->rgid;
1323         UWRAP_UNLOCK(uwrap_id);
1324
1325         return gid;
1326 }
1327
1328 gid_t getgid(void)
1329 {
1330         if (!uid_wrapper_enabled()) {
1331                 return libc_getgid();
1332         }
1333
1334         uwrap_init();
1335         return uwrap_getgid();
1336 }
1337
1338 /*
1339  * GETEGID
1340  */
1341 static uid_t uwrap_getegid(void)
1342 {
1343         struct uwrap_thread *id = uwrap_tls_id;
1344         gid_t gid;
1345
1346         UWRAP_LOCK(uwrap_id);
1347         gid = id->egid;
1348         UWRAP_UNLOCK(uwrap_id);
1349
1350         return gid;
1351 }
1352
1353 uid_t getegid(void)
1354 {
1355         if (!uid_wrapper_enabled()) {
1356                 return libc_getegid();
1357         }
1358
1359         uwrap_init();
1360         return uwrap_getegid();
1361 }
1362
1363 static int uwrap_setgroups_thread(size_t size, const gid_t *list)
1364 {
1365         struct uwrap_thread *id = uwrap_tls_id;
1366         int rc = -1;
1367
1368         UWRAP_LOCK(uwrap_id);
1369
1370         if (size == 0) {
1371                 SAFE_FREE(id->groups);
1372                 id->ngroups = 0;
1373         } else if (size > 0) {
1374                 gid_t *tmp;
1375
1376                 tmp = realloc(id->groups, sizeof(gid_t) * size);
1377                 if (tmp == NULL) {
1378                         errno = ENOMEM;
1379                         goto out;
1380                 }
1381                 id->groups = tmp;
1382                 id->ngroups = size;
1383                 memcpy(id->groups, list, size * sizeof(gid_t));
1384         }
1385
1386         rc = 0;
1387 out:
1388         UWRAP_UNLOCK(uwrap_id);
1389
1390         return rc;
1391 }
1392
1393 static int uwrap_setgroups(size_t size, const gid_t *list)
1394 {
1395         struct uwrap_thread *id;
1396         int rc = -1;
1397
1398         UWRAP_LOCK(uwrap_id);
1399
1400         if (size == 0) {
1401                 for (id = uwrap.ids; id; id = id->next) {
1402                         SAFE_FREE(id->groups);
1403                         id->ngroups = 0;
1404
1405                 }
1406         } else if (size > 0) {
1407                 gid_t *tmp;
1408
1409                 for (id = uwrap.ids; id; id = id->next) {
1410                         tmp = realloc(id->groups, sizeof(gid_t) * size);
1411                         if (tmp == NULL) {
1412                                 errno = ENOMEM;
1413                                 goto out;
1414                         }
1415                         id->groups = tmp;
1416
1417                         id->ngroups = size;
1418                         memcpy(id->groups, list, size * sizeof(gid_t));
1419                 }
1420         }
1421
1422         rc = 0;
1423 out:
1424         UWRAP_UNLOCK(uwrap_id);
1425
1426         return rc;
1427 }
1428
1429 #ifdef HAVE_SETGROUPS_INT
1430 int setgroups(int size, const gid_t *list)
1431 #else
1432 int setgroups(size_t size, const gid_t *list)
1433 #endif
1434 {
1435         if (!uid_wrapper_enabled()) {
1436                 return libc_setgroups(size, list);
1437         }
1438
1439         uwrap_init();
1440         return uwrap_setgroups(size, list);
1441 }
1442
1443 static int uwrap_getgroups(int size, gid_t *list)
1444 {
1445         struct uwrap_thread *id = uwrap_tls_id;
1446         int ngroups;
1447
1448         UWRAP_LOCK(uwrap_id);
1449         ngroups = id->ngroups;
1450
1451         if (size > ngroups) {
1452                 size = ngroups;
1453         }
1454         if (size == 0) {
1455                 goto out;
1456         }
1457         if (size < ngroups) {
1458                 errno = EINVAL;
1459                 ngroups = -1;
1460         }
1461         memcpy(list, id->groups, size * sizeof(gid_t));
1462
1463 out:
1464         UWRAP_UNLOCK(uwrap_id);
1465
1466         return ngroups;
1467 }
1468
1469 int getgroups(int size, gid_t *list)
1470 {
1471         if (!uid_wrapper_enabled()) {
1472                 return libc_getgroups(size, list);
1473         }
1474
1475         uwrap_init();
1476         return uwrap_getgroups(size, list);
1477 }
1478
1479 #if (defined(HAVE_SYS_SYSCALL_H) || defined(HAVE_SYSCALL_H)) \
1480     && (defined(SYS_setreuid) || defined(SYS_setreuid32))
1481 static long int uwrap_syscall (long int sysno, va_list vp)
1482 {
1483         long int rc;
1484
1485         switch (sysno) {
1486                 /* gid */
1487                 case SYS_getgid:
1488 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1489                 case SYS_getgid32:
1490 #endif
1491                         {
1492                                 rc = uwrap_getgid();
1493                         }
1494                         break;
1495 #ifdef SYS_getegid
1496                 case SYS_getegid:
1497 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1498                 case SYS_getegid32:
1499 #endif
1500                         {
1501                                 rc = uwrap_getegid();
1502                         }
1503                         break;
1504 #endif /* SYS_getegid */
1505                 case SYS_setgid:
1506 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1507                 case SYS_setgid32:
1508 #endif
1509                         {
1510                                 gid_t gid = (gid_t) va_arg(vp, gid_t);
1511
1512                                 rc = uwrap_setresgid_thread(gid, -1, -1);
1513                         }
1514                         break;
1515                 case SYS_setregid:
1516 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1517                 case SYS_setregid32:
1518 #endif
1519                         {
1520                                 gid_t rgid = (gid_t) va_arg(vp, gid_t);
1521                                 gid_t egid = (gid_t) va_arg(vp, gid_t);
1522
1523                                 rc = uwrap_setresgid_thread(rgid, egid, -1);
1524                         }
1525                         break;
1526 #ifdef SYS_setresgid
1527                 case SYS_setresgid:
1528 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1529                 case SYS_setresgid32:
1530 #endif
1531                         {
1532                                 gid_t rgid = (gid_t) va_arg(vp, gid_t);
1533                                 gid_t egid = (gid_t) va_arg(vp, gid_t);
1534                                 gid_t sgid = (gid_t) va_arg(vp, gid_t);
1535
1536                                 rc = uwrap_setresgid_thread(rgid, egid, sgid);
1537                         }
1538                         break;
1539 #endif /* SYS_setresgid */
1540 #ifdef SYS_getresgid
1541                 case SYS_getresgid:
1542 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1543                 case SYS_getresgid32:
1544 #endif
1545                         {
1546                                 gid_t *rgid = (gid_t *) va_arg(vp, gid_t *);
1547                                 gid_t *egid = (gid_t *) va_arg(vp, gid_t *);
1548                                 gid_t *sgid = (gid_t *) va_arg(vp, gid_t *);
1549
1550                                 rc = uwrap_getresgid(rgid, egid, sgid);
1551                         }
1552                         break;
1553 #endif /* SYS_getresgid */
1554
1555                 /* uid */
1556                 case SYS_getuid:
1557 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1558                 case SYS_getuid32:
1559 #endif
1560                         {
1561                                 rc = uwrap_getuid();
1562                         }
1563                         break;
1564 #ifdef SYS_geteuid
1565                 case SYS_geteuid:
1566 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1567                 case SYS_geteuid32:
1568 #endif
1569                         {
1570                                 rc = uwrap_geteuid();
1571                         }
1572                         break;
1573 #endif /* SYS_geteuid */
1574                 case SYS_setuid:
1575 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1576                 case SYS_setuid32:
1577 #endif
1578                         {
1579                                 uid_t uid = (uid_t) va_arg(vp, uid_t);
1580
1581                                 rc = uwrap_setresuid_thread(uid, -1, -1);
1582                         }
1583                         break;
1584                 case SYS_setreuid:
1585 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1586                 case SYS_setreuid32:
1587 #endif
1588                         {
1589                                 uid_t ruid = (uid_t) va_arg(vp, uid_t);
1590                                 uid_t euid = (uid_t) va_arg(vp, uid_t);
1591
1592                                 rc = uwrap_setresuid_thread(ruid, euid, -1);
1593                         }
1594                         break;
1595 #ifdef SYS_setresuid
1596                 case SYS_setresuid:
1597 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1598                 case SYS_setresuid32:
1599 #endif
1600                         {
1601                                 uid_t ruid = (uid_t) va_arg(vp, uid_t);
1602                                 uid_t euid = (uid_t) va_arg(vp, uid_t);
1603                                 uid_t suid = (uid_t) va_arg(vp, uid_t);
1604
1605                                 rc = uwrap_setresuid_thread(ruid, euid, suid);
1606                         }
1607                         break;
1608 #endif /* SYS_setresuid */
1609 #ifdef SYS_getresuid
1610                 case SYS_getresuid:
1611 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1612                 case SYS_getresuid32:
1613 #endif
1614                         {
1615                                 uid_t *ruid = (uid_t *) va_arg(vp, uid_t *);
1616                                 uid_t *euid = (uid_t *) va_arg(vp, uid_t *);
1617                                 uid_t *suid = (uid_t *) va_arg(vp, uid_t *);
1618
1619                                 rc = uwrap_getresuid(ruid, euid, suid);
1620                         }
1621                         break;
1622 #endif /* SYS_getresuid */
1623                 /* groups */
1624                 case SYS_setgroups:
1625 #ifdef HAVE_LINUX_32BIT_SYSCALLS
1626                 case SYS_setgroups32:
1627 #endif
1628                         {
1629                                 size_t size = (size_t) va_arg(vp, size_t);
1630                                 gid_t *list = (gid_t *) va_arg(vp, int *);
1631
1632                                 rc = uwrap_setgroups_thread(size, list);
1633                         }
1634                         break;
1635                 default:
1636                         UWRAP_LOG(UWRAP_LOG_DEBUG,
1637                                   "UID_WRAPPER calling non-wrapped syscall %lu\n",
1638                                   sysno);
1639
1640                         rc = libc_vsyscall(sysno, vp);
1641                         break;
1642         }
1643
1644         return rc;
1645 }
1646
1647 #ifdef HAVE_SYSCALL
1648 #ifdef HAVE_SYSCALL_INT
1649 int syscall (int sysno, ...)
1650 #else
1651 long int syscall (long int sysno, ...)
1652 #endif
1653 {
1654 #ifdef HAVE_SYSCALL_INT
1655         int rc;
1656 #else
1657         long int rc;
1658 #endif
1659         va_list va;
1660
1661         va_start(va, sysno);
1662
1663         if (!uid_wrapper_enabled()) {
1664                 rc = libc_vsyscall(sysno, va);
1665                 va_end(va);
1666                 return rc;
1667         }
1668
1669         uwrap_init();
1670         rc = uwrap_syscall(sysno, va);
1671         va_end(va);
1672
1673         return rc;
1674 }
1675 #endif /* HAVE_SYSCALL */
1676 #endif /* HAVE_SYS_SYSCALL_H || HAVE_SYSCALL_H */
1677
1678 /****************************
1679  * CONSTRUCTOR
1680  ***************************/
1681 void uwrap_constructor(void)
1682 {
1683         /*
1684         * If we hold a lock and the application forks, then the child
1685         * is not able to unlock the mutex and we are in a deadlock.
1686         * This should prevent such deadlocks.
1687         */
1688         pthread_atfork(&uwrap_thread_prepare,
1689                        &uwrap_thread_parent,
1690                        &uwrap_thread_child);
1691
1692         /* Here is safe place to call uwrap_init() and initialize data
1693          * for main process.
1694          */
1695         uwrap_init();
1696 }
1697
1698 /****************************
1699  * DESTRUCTOR
1700  ***************************/
1701
1702 /*
1703  * This function is called when the library is unloaded and makes sure that
1704  * resources are freed.
1705  */
1706 void uwrap_destructor(void)
1707 {
1708         struct uwrap_thread *u = uwrap.ids;
1709
1710         UWRAP_LOCK_ALL;
1711
1712         while (u != NULL) {
1713                 UWRAP_DLIST_REMOVE(uwrap.ids, u);
1714
1715                 SAFE_FREE(u->groups);
1716                 SAFE_FREE(u);
1717
1718                 u = uwrap.ids;
1719         }
1720
1721
1722         if (uwrap.libc.handle != NULL) {
1723                 dlclose(uwrap.libc.handle);
1724         }
1725
1726         if (uwrap.libpthread.handle != NULL) {
1727                 dlclose(uwrap.libpthread.handle);
1728         }
1729
1730         UWRAP_UNLOCK_ALL;
1731 }