38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
373
323
{ .name = "global-options", .key = 'g',
374
324
.arg = "OPTION[,OPTION[,...]]",
375
325
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
326
{ .name = "global-envs", .key = 'e',
377
327
.arg = "VAR=value",
378
328
.doc = "Environment variable passed to all plugins" },
379
329
{ .name = "options-for", .key = 'o',
380
330
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
331
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
332
{ .name = "envs-for", .key = 'f',
383
333
.arg = "PLUGIN:ENV=value",
384
334
.doc = "Environment variable passed to specified plugin" },
385
335
{ .name = "disable", .key = 'd',
387
337
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
390
.doc = "Enable a specific plugin", .group = 1 },
391
338
{ .name = "plugin-dir", .key = 128,
392
339
.arg = "DIRECTORY",
393
340
.doc = "Specify a different plugin directory", .group = 2 },
394
{ .name = "config-file", .key = 129,
396
.doc = "Specify a different configuration file", .group = 2 },
397
{ .name = "userid", .key = 130,
398
.arg = "ID", .flags = 0,
399
.doc = "User ID the plugins will run as", .group = 3 },
400
{ .name = "groupid", .key = 131,
401
.arg = "ID", .flags = 0,
402
.doc = "Group ID the plugins will run as", .group = 3 },
403
{ .name = "debug", .key = 132,
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 },
341
{ .name = "userid", .key = 129,
342
.arg = "ID", .flags = 0,
343
.doc = "User ID the plugins will run as", .group = 2 },
344
{ .name = "groupid", .key = 130,
345
.arg = "ID", .flags = 0,
346
.doc = "Group ID the plugins will run as", .group = 2 },
347
{ .name = "debug", .key = 131,
348
.doc = "Debug mode", .group = 3 },
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
422
case 'g': /* --global-options */
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
435
case 'o': /* --options-for */
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)){
458
case 'E': /* --env-for */
352
error_t parse_opt (int key, char *arg, struct argp_state *state) {
353
/* Get the INPUT argument from `argp_parse', which we know is a
354
pointer to our plugin list pointer. */
355
plugin **plugins = state->input;
360
while((p = strsep(&arg, ",")) != NULL){
364
if(not add_argument(getplugin(NULL, plugins), p)){
365
perror("add_argument");
366
return ARGP_ERR_UNKNOWN;
376
char *envdef = strdup(arg);
380
if(not add_environment(getplugin(NULL, plugins), envdef)){
381
perror("add_environment");
387
char *p_name = strsep(&arg, ":");
388
if(p_name[0] == '\0'){
391
char *opt = strsep(&arg, ":");
397
while((p = strsep(&opt, ",")) != NULL){
401
if(not add_argument(getplugin(p_name, plugins), p)){
402
perror("add_argument");
403
return ARGP_ERR_UNKNOWN;
460
414
char *envdef = strchr(arg, ':');
461
415
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
469
argp_error(state, "Empty plugin name");
473
add_environment(getplugin(arg), envdef, true);
476
case 'd': /* --disable */
478
plugin *p = getplugin(arg);
484
case 'e': /* --enable */
486
plugin *p = getplugin(arg);
492
case 128: /* --plugin-dir */
494
plugindir = strdup(arg);
496
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
499
case 130: /* --userid */
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);
509
case 131: /* --groupid */
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);
519
case 132: /* --debug */
423
if(not add_environment(getplugin(p_name, plugins), envdef)){
424
perror("add_environment");
430
plugin *p = getplugin(arg, plugins);
432
return ARGP_ERR_UNKNOWN;
441
uid = (uid_t)strtol(arg, NULL, 10);
444
gid = (gid_t)strtol(arg, NULL, 10);
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.
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
548
return ARGP_ERR_UNKNOWN;
550
return errno; /* Set to 0 at start */
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
568
case 129: /* --config-file */
570
argfile = strdup(arg);
572
case 130: /* --userid */
573
case 131: /* --groupid */
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
581
return ARGP_ERR_UNKNOWN;
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
450
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
455
return ARGP_ERR_UNKNOWN;
460
plugin *plugin_list = NULL;
462
struct argp argp = { .options = options, .parser = parse_opt,
463
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
589
464
.doc = "Mandos plugin runner -- Run plugins" };
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
606
exitstatus = EX_USAGE;
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
613
/* Open the configfile if available */
615
conffp = fopen(AFILE, "r");
617
conffp = fopen(argfile, "r");
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
if (ret == ARGP_ERR_UNKNOWN){
468
fprintf(stderr, "Unknown error while parsing arguments\n");
469
exitstatus = EXIT_FAILURE;
473
conffp = fopen(argfile, "r");
619
474
if(conffp != NULL){
620
475
char *org_line = NULL;
621
476
char *p, *arg, *new_arg, *line;
623
479
const char whitespace_delims[] = " \r\t\f\v\n";
624
480
const char comment_delim[] = "#";
627
custom_argv = malloc(sizeof(char*) * 2);
628
if(custom_argv == NULL){
630
exitstatus = EX_OSERR;
633
custom_argv[0] = argv[0];
634
custom_argv[1] = NULL;
636
/* for each line in the config file, strip whitespace and ignore
639
483
sret = getline(&org_line, &size, conffp);
645
489
arg = strsep(&line, comment_delim);
646
490
while((p = strsep(&arg, whitespace_delims)) != NULL){
1000
756
if(p->environ[0] == NULL){
1001
757
if(execv(filename, p->argv) < 0){
1002
758
perror("execv");
1006
762
if(execve(filename, p->argv, p->environ) < 0){
1007
763
perror("execve");
1013
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
1019
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
771
close(pipefd[1]); /* close unused write end of pipe */
772
process *new_process = malloc(sizeof(process));
773
if (new_process == NULL){
775
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1024
perror("sigprocmask");
777
perror("sigprocmask");
1026
exitstatus = EX_OSERR;
779
exitstatus = EXIT_FAILURE;
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
783
*new_process = (struct process){ .pid = pid,
785
.next = process_list };
787
process_list = new_process;
1033
788
/* Unblock SIGCHLD so signal handler can be run if this process
1034
789
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1039
792
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
793
exitstatus = EXIT_FAILURE;
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
797
FD_SET(new_process->fd, &rfds_all);
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
1052
TEMP_FAILURE_RETRY(closedir(dir));
805
free_plugin_list(plugin_list);
1054
free_plugin(getplugin(NULL));
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1060
if(p->next == NULL){
1061
fprintf(stderr, "No plugin processes started. Incorrect plugin"
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1067
/* Main loop while running plugins exist */
1069
817
fd_set rfds = rfds_all;
1070
818
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
819
if (select_ret == -1){
1072
820
perror("select");
1073
exitstatus = EX_OSERR;
821
exitstatus = EXIT_FAILURE;
1076
824
/* OK, now either a process completed, or something can be read
1077
825
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
826
for(process *proc = process_list; proc ; proc = proc->next){
1079
827
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
828
if(proc->eof and proc->completed){
1081
829
/* Only accept the plugin output if it exited cleanly */
1082
830
if(not WIFEXITED(proc->status)
1083
831
or WEXITSTATUS(proc->status) != 0){
1084
832
/* Bad exit by plugin */
1087
834
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
1091
837
WEXITSTATUS(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)));
838
} else if(WIFSIGNALED(proc->status)) {
839
fprintf(stderr, "Plugin %u killed by signal %d\n",
840
(unsigned int) (proc->pid),
841
WTERMSIG(proc->status));
1098
842
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
1104
847
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
848
FD_CLR(proc->fd, &rfds_all);
1108
849
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
&sigchld_action.sa_mask,
850
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1114
852
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
853
exitstatus = EXIT_FAILURE;
1119
plugin *next_plugin = proc->next;
856
/* Delete this process entry from the list */
857
if(process_list == proc){
858
/* First one - simple */
859
process_list = proc->next;
861
/* Second one or later */
862
for(process *p = process_list; p != NULL; p = p->next){
864
p->next = proc->next;
1123
869
/* 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)));
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1128
873
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1133
if(plugin_list == NULL){
877
/* We deleted this process from the list, so we can't go
878
proc->next. Therefore, start over from the beginning of
1140
882
/* This process exited nicely, so print its buffer */
1142
884
bool bret = print_out_password(proc->buffer,
1143
885
proc->buffer_length);
1145
887
perror("print_out_password");
1146
exitstatus = EX_IOERR;
888
exitstatus = EXIT_FAILURE;
1151
892
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
893
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
894
/* This process had nothing to say at this time */
1159
897
/* Before reading, make the process' data buffer large enough */
1160
898
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
899
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
900
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
901
if (proc->buffer == NULL){
1164
902
perror("malloc");
1165
exitstatus = EX_OSERR;
903
exitstatus = EXIT_FAILURE;
1168
906
proc->buffer_size += BUFFER_SIZE;
1170
908
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1173
+ proc->buffer_length,
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1176
912
/* Read error from this process; ignore the error */
1182
917
proc->eof = true;
1184
proc->buffer_length += (size_t) sret;
919
proc->buffer_length += (size_t) ret;
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1194
928
/* Fallback if all plugins failed, none are found or an error
1197
931
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
932
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1205
bret = print_out_password(passwordbuffer, len);
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1207
935
perror("print_out_password");
1208
exitstatus = EX_IOERR;
936
exitstatus = EXIT_FAILURE;