24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
30
#include <stdbool.h> /* bool, true, false */
30
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
32
stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
97
104
/* Gets an existing plugin based on name,
98
105
or if none is found, creates a new one */
99
106
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
110
or (p->name and name and (strcmp(p->name, name) == 0))){
107
114
/* Create a new plugin */
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
115
plugin *new_plugin = NULL;
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
112
122
char *copy_name = NULL;
113
123
if(name != NULL){
114
copy_name = strdup(name);
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
115
127
if(copy_name == NULL){
120
*new_plugin = (plugin) { .name = copy_name,
123
.next = plugin_list };
135
*new_plugin = (plugin){ .name = copy_name,
138
.next = plugin_list };
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
128
146
free(new_plugin);
131
150
new_plugin->argv[0] = copy_name;
132
151
new_plugin->argv[1] = NULL;
134
new_plugin->environ = malloc(sizeof(char *));
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
135
156
if(new_plugin->environ == NULL){
137
159
free(new_plugin->argv);
138
160
free(new_plugin);
141
164
new_plugin->environ[0] = NULL;
367
402
.doc = "Group ID the plugins will run as", .group = 3 },
368
403
{ .name = "debug", .key = 132,
369
404
.doc = "Debug mode", .group = 4 },
406
* These reproduce what we would get without ARGP_NO_HELP
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
376
422
case 'g': /* --global-options */
379
while((p = strsep(&arg, ",")) != NULL){
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
390
432
case 'G': /* --global-env */
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
433
add_environment(getplugin(NULL), arg, true);
398
435
case 'o': /* --options-for */
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
409
while((p = strsep(&opt, ",")) != NULL){
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
446
argp_error(state, "Empty plugin name");
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
420
458
case 'E': /* --env-for */
425
460
char *envdef = strchr(arg, ':');
426
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
469
argp_error(state, "Empty plugin name");
473
add_environment(getplugin(arg), envdef, true);
435
476
case 'd': /* --disable */
437
478
plugin *p = getplugin(arg);
439
return ARGP_ERR_UNKNOWN;
444
484
case 'e': /* --enable */
446
486
plugin *p = getplugin(arg);
448
return ARGP_ERR_UNKNOWN;
453
492
case 128: /* --plugin-dir */
455
494
plugindir = strdup(arg);
456
if(plugindir == NULL){
460
496
case 129: /* --config-file */
461
497
/* This is already done by parse_opt_config_file() */
463
499
case 130: /* --userid */
464
uid = (uid_t)strtol(arg, NULL, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
466
509
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
469
519
case 132: /* --debug */
523
* These reproduce what we would get without ARGP_NO_HELP
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
472
540
case ARGP_KEY_ARG:
473
541
/* Cryptsetup always passes an argument, which is an empty
474
542
string if "none" was specified in /etc/crypttab. So if
475
543
argument was empty, we ignore it silently. */
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
483
548
return ARGP_ERR_UNKNOWN;
550
return errno; /* Set to 0 at start */
488
553
/* This option parser is the same as parse_opt() above, except it
489
554
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
494
560
case 'g': /* --global-options */
495
561
case 'G': /* --global-env */
496
562
case 'o': /* --options-for */
586
660
* ((unsigned int) custom_argc + 1));
587
661
if(custom_argv == NULL){
588
662
perror("realloc");
589
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
593
667
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
676
exitstatus = EX_IOERR;
599
681
/* Check for harmful errors and go to fallback. Other errors might
600
682
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_IOERR;
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
609
691
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
705
exitstatus = EX_CONFIG;
619
710
/* Parse actual command line arguments, to let them override the
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
725
exitstatus = EX_USAGE;
642
743
/* Strip permissions down to nobody */
643
748
ret = setuid(uid);
645
750
perror("setuid");
652
if (plugindir == NULL){
655
dir = opendir(plugindir);
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
/* Open plugin directory with close_on_exec flag */
666
int dir_fd = dirfd(dir);
668
ret = set_cloexec_flag(dir_fd);
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
760
#else /* not O_CLOEXEC */
762
#endif /* not O_CLOEXEC */
765
dir_fd = open(plugindir, O_RDONLY |
768
#else /* not O_CLOEXEC */
770
#endif /* not O_CLOEXEC */
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
788
#endif /* O_CLOEXEC */
790
dir = fdopendir(dir_fd);
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
923
1063
free_plugin_list();
927
1067
/* Main loop while running plugins exist */
928
1068
while(plugin_list){
929
1069
fd_set rfds = rfds_all;
930
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
if (select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
932
1072
perror("select");
933
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
936
1076
/* OK, now either a process completed, or something can be read
937
1077
from one of them */
938
1078
for(plugin *proc = plugin_list; proc != NULL;){
939
1079
/* Is this process completely done? */
940
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
941
1081
/* Only accept the plugin output if it exited cleanly */
942
1082
if(not WIFEXITED(proc->status)
943
1083
or WEXITSTATUS(proc->status) != 0){
944
1084
/* Bad exit by plugin */
947
1087
if(WIFEXITED(proc->status)){
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
950
1091
WEXITSTATUS(proc->status));
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
955
1098
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
961
1104
/* Remove the plugin */
962
FD_CLR(proc->fd, &rfds_all);
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
964
1108
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
981
if(plugin_list == NULL){
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
&sigchld_action.sa_mask,
1114
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
985
1119
plugin *next_plugin = proc->next;
986
1120
free_plugin(proc);
987
1121
proc = next_plugin;
1123
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
1128
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1133
if(plugin_list == NULL){
991
1140
/* This process exited nicely, so print its buffer */
993
1142
bool bret = print_out_password(proc->buffer,
994
1143
proc->buffer_length);
996
1145
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
1002
1151
/* This process has not completed. Does it have any output? */
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1004
1155
/* This process had nothing to say at this time */
1005
1156
proc = proc->next;