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(),
411
374
.doc = "Group ID the plugins will run as", .group = 3 },
412
375
{ .name = "debug", .key = 132,
413
376
.doc = "Debug mode", .group = 4 },
415
* These reproduce what we would get without ARGP_NO_HELP
417
{ .name = "help", .key = '?',
418
.doc = "Give this help list", .group = -1 },
419
{ .name = "usage", .key = -3,
420
.doc = "Give a short usage message", .group = -1 },
421
{ .name = "version", .key = 'V',
422
.doc = "Print program version", .group = -1 },
426
__attribute__((nonnull(3)))
427
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){
432
383
case 'g': /* --global-options */
435
while((plugin_option = strsep(&arg, ",")) != NULL){
436
if(not add_argument(getplugin(NULL), plugin_option)){
386
while((p = strsep(&arg, ",")) != NULL){
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
442
397
case 'G': /* --global-env */
443
add_environment(getplugin(NULL), arg, true);
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
445
405
case 'o': /* --options-for */
447
char *option_list = strchr(arg, ':');
448
if(option_list == NULL){
449
argp_error(state, "No colon in \"%s\"", arg);
456
argp_error(state, "Empty plugin name");
461
while((option = strsep(&option_list, ",")) != NULL){
462
if(not add_argument(getplugin(arg), option)){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
416
while((p = strsep(&opt, ",")) != NULL){
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
468
427
case 'E': /* --env-for */
470
432
char *envdef = strchr(arg, ':');
471
433
if(envdef == NULL){
472
argp_error(state, "No colon in \"%s\"", arg);
479
argp_error(state, "Empty plugin name");
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
483
add_environment(getplugin(arg), envdef, true);
486
442
case 'd': /* --disable */
488
444
plugin *p = getplugin(arg);
446
return ARGP_ERR_UNKNOWN;
494
451
case 'e': /* --enable */
496
453
plugin *p = getplugin(arg);
455
return ARGP_ERR_UNKNOWN;
502
460
case 128: /* --plugin-dir */
504
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
506
467
case 129: /* --config-file */
507
468
/* This is already done by parse_opt_config_file() */
509
470
case 130: /* --userid */
510
tmp_id = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmp_id != (uid_t)tmp_id){
513
argp_error(state, "Bad user ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)uid);
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
519
480
case 131: /* --groupid */
520
tmp_id = strtoimax(arg, &tmp, 10);
521
if(errno != 0 or tmp == arg or *tmp != '\0'
522
or tmp_id != (gid_t)tmp_id){
523
argp_error(state, "Bad group ID number: \"%s\", using %"
524
PRIdMAX, arg, (intmax_t)gid);
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
529
490
case 132: /* --debug */
533
* These reproduce what we would get without ARGP_NO_HELP
535
case '?': /* --help */
536
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
537
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
538
case -3: /* --usage */
539
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
540
argp_state_help(state, state->out_stream,
541
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
542
case 'V': /* --version */
543
fprintf(state->out_stream, "%s\n", argp_program_version);
547
494
* When adding more options before this line, remember to also add a
548
495
* "case" to the "parse_opt_config_file" function below.
660
600
new_arg = strdup(p);
661
601
if(new_arg == NULL){
662
error(0, errno, "strdup");
663
exitstatus = EX_OSERR;
603
exitstatus = EXIT_FAILURE;
668
608
custom_argc += 1;
670
char **new_argv = realloc(custom_argv, sizeof(char *)
673
if(new_argv == NULL){
674
error(0, errno, "realloc");
675
exitstatus = EX_OSERR;
680
custom_argv = new_argv;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
613
exitstatus = EXIT_FAILURE;
683
617
custom_argv[custom_argc-1] = new_arg;
684
custom_argv[custom_argc] = NULL;
618
custom_argv[custom_argc] = NULL;
688
ret = fclose(conffp);
689
} while(ret == EOF and errno == EINTR);
691
error(0, errno, "fclose");
692
exitstatus = EX_IOERR;
697
623
/* Check for harmful errors and go to fallback. Other errors might
698
624
not affect opening plugins */
699
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
700
error(0, errno, "fopen");
701
exitstatus = EX_OSERR;
627
exitstatus = EXIT_FAILURE;
705
/* If there were any arguments from the configuration file, pass
706
them to parser as command line arguments */
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
707
633
if(custom_argv != NULL){
708
ret = argp_parse(&argp, custom_argc, custom_argv,
709
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
717
error(0, errno, "argp_parse");
718
exitstatus = EX_OSERR;
721
exitstatus = EX_CONFIG;
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
726
643
/* Parse actual command line arguments, to let them override the
728
ret = argp_parse(&argp, argc, argv,
729
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
737
error(0, errno, "argp_parse");
738
exitstatus = EX_OSERR;
741
exitstatus = EX_USAGE;
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
760
/* Work around Debian bug #633582:
761
<http://bugs.debian.org/633582> */
762
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
763
if(plugindir_fd == -1){
764
error(0, errno, "open");
766
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
768
error(0, errno, "fstat");
770
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
771
ret = fchown(plugindir_fd, uid, gid);
773
error(0, errno, "fchown");
777
TEMP_FAILURE_RETRY(close(plugindir_fd));
781
/* Lower permissions */
666
/* Strip permissions down to nobody */
784
error(0, errno, "setgid");
786
671
ret = setuid(uid);
788
error(0, errno, "setuid");
791
/* Open plugin directory with close_on_exec flag */
676
if(plugindir == NULL){
679
dir = opendir(plugindir);
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
794
if(plugindir == NULL){
795
dir_fd = open(PDIR, O_RDONLY |
798
#else /* not O_CLOEXEC */
800
#endif /* not O_CLOEXEC */
803
dir_fd = open(plugindir, O_RDONLY |
806
#else /* not O_CLOEXEC */
808
#endif /* not O_CLOEXEC */
812
error(0, errno, "Could not open plugin dir");
813
exitstatus = EX_UNAVAILABLE;
818
/* Set the FD_CLOEXEC flag on the directory */
819
ret = set_cloexec_flag(dir_fd);
821
error(0, errno, "set_cloexec_flag");
822
TEMP_FAILURE_RETRY(close(dir_fd));
823
exitstatus = EX_OSERR;
826
#endif /* O_CLOEXEC */
828
dir = fdopendir(dir_fd);
830
error(0, errno, "Could not open plugin dir");
831
TEMP_FAILURE_RETRY(close(dir_fd));
832
exitstatus = EX_OSERR;
690
int dir_fd = dirfd(dir);
692
ret = set_cloexec_flag(dir_fd);
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
918
764
if(plugindir == NULL){
919
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
922
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
927
error(0, errno, "asprintf");
931
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
774
ret = stat(filename, &st);
933
error(0, errno, "stat");
938
781
/* Ignore non-executable files */
939
if(not S_ISREG(st.st_mode)
940
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
942
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
943
785
" with bad type or mode\n", filename);
983
825
if(p->environ[0] != NULL){
984
826
for(char **e = environ; *e != NULL; e++){
985
827
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
828
perror("add_environment");
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
error(0, errno, "pipe");
995
exitstatus = EX_OSERR;
837
exitstatus = EXIT_FAILURE;
998
840
/* Ask OS to automatic close the pipe on exec */
999
841
ret = set_cloexec_flag(pipefd[0]);
1001
error(0, errno, "set_cloexec_flag");
1002
exitstatus = EX_OSERR;
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1005
847
ret = set_cloexec_flag(pipefd[1]);
1007
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
1011
853
/* Block SIGCHLD until process is safely in process list */
1012
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1013
&sigchld_action.sa_mask,
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1016
error(0, errno, "sigprocmask");
1017
exitstatus = EX_OSERR;
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
1020
860
/* Starting a new process to be watched */
1024
} while(pid == -1 and errno == EINTR);
1026
error(0, errno, "fork");
1027
exitstatus = EX_OSERR;
864
exitstatus = EXIT_FAILURE;
1031
868
/* this is the child process */
1032
869
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1034
error(0, errno, "sigaction");
1037
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1039
error(0, errno, "sigprocmask");
876
perror("sigprocmask");
1043
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1045
error(0, errno, "dup2");
1049
886
if(dirfd(dir) < 0){
1054
891
if(p->environ[0] == NULL){
1055
892
if(execv(filename, p->argv) < 0){
1056
error(0, errno, "execv for %s", filename);
1060
897
if(execve(filename, p->argv, p->environ) < 0){
1061
error(0, errno, "execve for %s", filename);
1067
904
/* Parent process */
1068
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
905
close(pipefd[1]); /* Close unused write end of pipe */
1071
907
plugin *new_plugin = getplugin(dirst->d_name);
1072
908
if(new_plugin == NULL){
1073
error(0, errno, "getplugin");
1074
ret = (int)(TEMP_FAILURE_RETRY
1075
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
error(0, errno, "sigprocmask");
912
perror("sigprocmask");
1080
exitstatus = EX_OSERR;
914
exitstatus = EXIT_FAILURE;
1087
921
/* Unblock SIGCHLD so signal handler can be run if this process
1088
922
has already completed */
1089
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1090
&sigchld_action.sa_mask,
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1093
error(0, errno, "sigprocmask");
1094
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1098
#if defined (__GNUC__) and defined (__GLIBC__)
1099
#if not __GLIBC_PREREQ(2, 16)
1100
#pragma GCC diagnostic push
1101
#pragma GCC diagnostic ignored "-Wsign-conversion"
1104
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion in GNU libc
1107
#if defined (__GNUC__) and defined (__GLIBC__)
1108
#if not __GLIBC_PREREQ(2, 16)
1109
#pragma GCC diagnostic pop
930
FD_SET(new_plugin->fd, &rfds_all);
1113
932
if(maxfd < new_plugin->fd){
1114
933
maxfd = new_plugin->fd;
1118
TEMP_FAILURE_RETRY(closedir(dir));
1120
939
free_plugin(getplugin(NULL));
1220
1021
bool bret = print_out_password(proc->buffer,
1221
1022
proc->buffer_length);
1223
error(0, errno, "print_out_password");
1224
exitstatus = EX_IOERR;
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1229
1030
/* This process has not completed. Does it have any output? */
1230
#if defined (__GNUC__) and defined (__GLIBC__)
1231
#if not __GLIBC_PREREQ(2, 16)
1232
#pragma GCC diagnostic push
1233
#pragma GCC diagnostic ignored "-Wsign-conversion"
1236
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic pop
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1247
1032
/* This process had nothing to say at this time */
1248
1033
proc = proc->next;
1251
1036
/* Before reading, make the process' data buffer large enough */
1252
1037
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1253
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1254
+ (size_t) BUFFER_SIZE);
1255
if(new_buffer == NULL){
1256
error(0, errno, "malloc");
1257
exitstatus = EX_OSERR;
1038
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
1042
exitstatus = EXIT_FAILURE;
1260
proc->buffer = new_buffer;
1261
1045
proc->buffer_size += BUFFER_SIZE;
1263
1047
/* Read from the process */
1264
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
+ proc->buffer_length,
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1269
1051
/* Read error from this process; ignore the error */
1270
1052
proc = proc->next;