19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
41
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
414
394
.doc = "Group ID the plugins will run as", .group = 3 },
415
395
{ .name = "debug", .key = 132,
416
396
.doc = "Debug mode", .group = 4 },
418
* These reproduce what we would get without ARGP_NO_HELP
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
435
405
case 'g': /* --global-options */
437
407
char *plugin_option;
438
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
439
412
if(not add_argument(getplugin(NULL), plugin_option)){
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
446
419
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
451
427
case 'o': /* --options-for */
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
462
argp_error(state, "Empty plugin name");
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
475
442
case 'E': /* --env-for */
477
447
char *envdef = strchr(arg, ':');
478
448
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
486
argp_error(state, "Empty plugin name");
490
if(add_environment(getplugin(arg), envdef, true)){
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
495
457
case 'd': /* --disable */
497
459
plugin *p = getplugin(arg);
461
return ARGP_ERR_UNKNOWN;
504
466
case 'e': /* --enable */
506
468
plugin *p = getplugin(arg);
470
return ARGP_ERR_UNKNOWN;
513
475
case 128: /* --plugin-dir */
515
477
plugindir = strdup(arg);
516
if(plugindir != NULL){
478
if(plugindir == NULL){
520
482
case 129: /* --config-file */
521
483
/* This is already done by parse_opt_config_file() */
523
485
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
487
tmpmax = strtoimax(arg, &tmp, 10);
525
488
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
534
496
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
498
tmpmax = strtoimax(arg, &tmp, 10);
536
499
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
545
507
case 132: /* --debug */
549
* These reproduce what we would get without ARGP_NO_HELP
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
563
511
* When adding more options before this line, remember to also add a
564
512
* "case" to the "parse_opt_config_file" function below.
716
648
/* Check for harmful errors and go to fallback. Other errors might
717
649
not affect opening plugins */
718
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
652
exitstatus = EXIT_FAILURE;
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
726
658
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
740
exitstatus = EX_CONFIG;
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
661
if(ret == ARGP_ERR_UNKNOWN){
662
fprintf(stderr, "Unknown error while parsing arguments\n");
663
exitstatus = EXIT_FAILURE;
745
668
/* Parse actual command line arguments, to let them override the
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
760
exitstatus = EX_USAGE;
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
784
error(0, errno, "open(\"" PDIR "\")");
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
789
error(0, errno, "fstat");
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
794
error(0, errno, "fchown");
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
802
/* Lower permissions */
691
/* Strip permissions down to nobody */
805
error(0, errno, "setgid");
807
696
ret = setuid(uid);
809
error(0, errno, "setuid");
812
/* Open plugin directory with close_on_exec flag */
701
if(plugindir == NULL){
704
dir = opendir(plugindir);
708
perror("Could not open plugin dir");
709
exitstatus = EXIT_FAILURE;
713
/* Set the FD_CLOEXEC flag on the directory, if possible */
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
817
#else /* not O_CLOEXEC */
819
#endif /* not O_CLOEXEC */
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
836
#endif /* O_CLOEXEC */
838
dir = fdopendir(dir_fd);
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
715
int dir_fd = dirfd(dir);
717
ret = set_cloexec_flag(dir_fd);
719
perror("set_cloexec_flag");
720
exitstatus = EXIT_FAILURE;
927
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
930
#else /* not O_CLOEXEC */
932
#endif /* not O_CLOEXEC */
935
error(0, errno, "Could not open plugin");
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
939
/* Set the FD_CLOEXEC flag on the plugin FD */
940
ret = set_cloexec_flag(plugin_fd);
942
error(0, errno, "set_cloexec_flag");
943
TEMP_FAILURE_RETRY(close(plugin_fd));
946
#endif /* O_CLOEXEC */
947
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
949
error(0, errno, "stat");
950
TEMP_FAILURE_RETRY(close(plugin_fd));
954
811
/* Ignore non-executable files */
955
812
if(not S_ISREG(st.st_mode)
956
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
959
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
960
" with bad type or mode\n",
961
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
" with bad type or mode\n", filename);
963
TEMP_FAILURE_RETRY(close(plugin_fd));
967
822
plugin *p = getplugin(dirst->d_name);
969
error(0, errno, "getplugin");
970
TEMP_FAILURE_RETRY(close(plugin_fd));
985
840
for(char **a = g->argv + 1; *a != NULL; a++){
986
841
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
842
perror("add_argument");
990
845
/* Add global environment variables */
991
846
for(char **e = g->environ; *e != NULL; e++){
992
847
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
848
perror("add_environment");
998
/* If this plugin has any environment variables, we need to
999
duplicate the environment from this process, too. */
853
/* If this plugin has any environment variables, we will call
854
using execve and need to duplicate the environment from this
1000
856
if(p->environ[0] != NULL){
1001
857
for(char **e = environ; *e != NULL; e++){
1002
858
if(not add_environment(p, *e, false)){
1003
error(0, errno, "add_environment");
859
perror("add_environment");
1068
924
above and must now close it manually here. */
1071
if(fexecve(plugin_fd, p->argv,
1072
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1073
error(0, errno, "fexecve for %s/%s",
1074
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
927
if(p->environ[0] == NULL){
928
if(execv(filename, p->argv) < 0){
933
if(execve(filename, p->argv, p->environ) < 0){
1079
940
/* Parent process */
1080
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1082
TEMP_FAILURE_RETRY(close(plugin_fd));
1083
944
plugin *new_plugin = getplugin(dirst->d_name);
1084
945
if(new_plugin == NULL){
1085
error(0, errno, "getplugin");
1086
947
ret = (int)(TEMP_FAILURE_RETRY
1087
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1090
error(0, errno, "sigprocmask");
951
perror("sigprocmask");
1092
exitstatus = EX_OSERR;
953
exitstatus = EXIT_FAILURE;
1232
1069
bool bret = print_out_password(proc->buffer,
1233
1070
proc->buffer_length);
1235
error(0, errno, "print_out_password");
1236
exitstatus = EX_IOERR;
1072
perror("print_out_password");
1073
exitstatus = EXIT_FAILURE;
1241
1078
/* This process has not completed. Does it have any output? */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic push
1245
#pragma GCC diagnostic ignored "-Wsign-conversion"
1248
1079
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1254
#if defined (__GNUC__) and defined (__GLIBC__)
1255
#if not __GLIBC_PREREQ(2, 16)
1256
#pragma GCC diagnostic pop
1259
1082
/* This process had nothing to say at this time */
1260
1083
proc = proc->next;
1263
1086
/* Before reading, make the process' data buffer large enough */
1264
1087
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1265
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1266
+ (size_t) BUFFER_SIZE);
1267
if(new_buffer == NULL){
1268
error(0, errno, "malloc");
1269
exitstatus = EX_OSERR;
1088
proc->buffer = realloc(proc->buffer, proc->buffer_size
1089
+ (size_t) BUFFER_SIZE);
1090
if(proc->buffer == NULL){
1092
exitstatus = EXIT_FAILURE;
1272
proc->buffer = new_buffer;
1273
1095
proc->buffer_size += BUFFER_SIZE;
1275
1097
/* Read from the process */