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(),
26
asprintf(), O_CLOEXEC */
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(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
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(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
65
SIG_UNBLOCK, kill() */
69
66
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
76
69
#define BUFFER_SIZE 256
404
374
.doc = "Group ID the plugins will run as", .group = 3 },
405
375
{ .name = "debug", .key = 132,
406
376
.doc = "Debug mode", .group = 4 },
408
* These reproduce what we would get without ARGP_NO_HELP
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
424
383
case 'g': /* --global-options */
426
385
char *plugin_option;
427
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
428
390
if(not add_argument(getplugin(NULL), plugin_option)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
434
397
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
437
405
case 'o': /* --options-for */
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
448
argp_error(state, "Empty plugin name");
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
460
420
case 'E': /* --env-for */
462
425
char *envdef = strchr(arg, ':');
463
426
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
471
argp_error(state, "Empty plugin name");
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
475
add_environment(getplugin(arg), envdef, true);
478
435
case 'd': /* --disable */
480
437
plugin *p = getplugin(arg);
439
return ARGP_ERR_UNKNOWN;
486
444
case 'e': /* --enable */
488
446
plugin *p = getplugin(arg);
448
return ARGP_ERR_UNKNOWN;
494
453
case 128: /* --plugin-dir */
496
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
498
460
case 129: /* --config-file */
499
461
/* This is already done by parse_opt_config_file() */
501
463
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
511
473
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
521
483
case 132: /* --debug */
525
* These reproduce what we would get without ARGP_NO_HELP
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
539
487
* When adding more options before this line, remember to also add a
540
488
* "case" to the "parse_opt_config_file" function below.
661
602
custom_argv = realloc(custom_argv, sizeof(char *)
662
603
* ((unsigned int) custom_argc + 1));
663
604
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
606
exitstatus = EXIT_FAILURE;
669
610
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
611
custom_argv[custom_argc] = NULL;
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
683
616
/* Check for harmful errors and go to fallback. Other errors might
684
617
not affect opening plugins */
685
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
620
exitstatus = EXIT_FAILURE;
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
693
626
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
707
exitstatus = EX_CONFIG;
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
if(ret == ARGP_ERR_UNKNOWN){
630
fprintf(stderr, "Unknown error while parsing arguments\n");
631
exitstatus = EXIT_FAILURE;
712
636
/* Parse actual command line arguments, to let them override the
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
727
exitstatus = EX_USAGE;
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
754
error(0, errno, "fstat");
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
759
error(0, errno, "fchown");
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
767
/* Lower permissions */
659
/* Strip permissions down to nobody */
770
error(0, errno, "setgid");
772
664
ret = setuid(uid);
774
error(0, errno, "setuid");
777
/* Open plugin directory with close_on_exec flag */
669
if(plugindir == NULL){
672
dir = opendir(plugindir);
676
perror("Could not open plugin dir");
677
exitstatus = EXIT_FAILURE;
681
/* Set the FD_CLOEXEC flag on the directory, if possible */
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
784
#else /* not O_CLOEXEC */
786
#endif /* not O_CLOEXEC */
789
dir_fd = open(plugindir, O_RDONLY |
792
#else /* not O_CLOEXEC */
794
#endif /* not O_CLOEXEC */
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
812
#endif /* O_CLOEXEC */
814
dir = fdopendir(dir_fd);
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
683
int dir_fd = dirfd(dir);
685
ret = set_cloexec_flag(dir_fd);
687
perror("set_cloexec_flag");
688
exitstatus = EXIT_FAILURE;
888
757
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
897
error(0, errno, "asprintf");
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
767
ret = stat(filename, &st);
903
error(0, errno, "stat");
908
774
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
912
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
778
" with bad type or mode\n", filename);
953
818
if(p->environ[0] != NULL){
954
819
for(char **e = environ; *e != NULL; e++){
955
820
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
821
perror("add_environment");
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
830
exitstatus = EXIT_FAILURE;
968
833
/* Ask OS to automatic close the pipe on exec */
969
834
ret = set_cloexec_flag(pipefd[0]);
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
836
perror("set_cloexec_flag");
837
exitstatus = EXIT_FAILURE;
975
840
ret = set_cloexec_flag(pipefd[1]);
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
981
846
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
990
853
/* Starting a new process to be watched */
994
} while(pid == -1 and errno == EINTR);
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
857
exitstatus = EXIT_FAILURE;
1001
861
/* this is the child process */
1002
862
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1004
error(0, errno, "sigaction");
1007
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1009
error(0, errno, "sigprocmask");
869
perror("sigprocmask");
1013
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1015
error(0, errno, "dup2");
1019
879
if(dirfd(dir) < 0){
1024
884
if(p->environ[0] == NULL){
1025
885
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1030
890
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1037
897
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
898
close(pipefd[1]); /* Close unused write end of pipe */
1041
900
plugin *new_plugin = getplugin(dirst->d_name);
1042
901
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1048
error(0, errno, "sigprocmask");
905
perror("sigprocmask");
1050
exitstatus = EX_OSERR;
907
exitstatus = EXIT_FAILURE;