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(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
89
94
size_t buffer_size;
90
95
size_t buffer_length;
92
volatile bool completed;
97
volatile sig_atomic_t completed;
94
99
struct plugin *next;
97
102
static plugin *plugin_list = NULL;
99
/* Gets a existing plugin based on name,
104
/* Gets an existing plugin based on name,
100
105
or if none is found, creates a new one */
101
106
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
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))){
109
114
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
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){
114
122
char *copy_name = NULL;
115
123
if(name != NULL){
116
copy_name = strdup(name);
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
117
127
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
135
*new_plugin = (plugin){ .name = copy_name,
138
.next = plugin_list };
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
130
146
free(new_plugin);
133
150
new_plugin->argv[0] = copy_name;
134
151
new_plugin->argv[1] = NULL;
136
new_plugin->environ = malloc(sizeof(char *));
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
137
156
if(new_plugin->environ == NULL){
139
159
free(new_plugin->argv);
140
160
free(new_plugin);
143
164
new_plugin->environ[0] = NULL;
145
166
/* Append the new plugin to the list */
146
167
plugin_list = new_plugin;
147
168
return new_plugin;
181
207
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
208
static bool add_environment(plugin *p, const char *def, bool replace){
212
/* namelen = length of name of environment variable */
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
186
232
return add_to_char_array(def, &(p->environ), &(p->envc));
190
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
237
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
194
static int set_cloexec_flag(int fd)
196
int ret = fcntl(fd, F_GETFD, 0);
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
197
242
/* If reading the flags failed, return error indication now. */
201
246
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
206
252
/* Mark processes as completed when they exit, and save their exit
208
void handle_sigchld(__attribute__((unused)) int sig){
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
210
257
plugin *proc = plugin_list;
327
373
{ .name = "global-options", .key = 'g',
328
374
.arg = "OPTION[,OPTION[,...]]",
329
375
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
376
{ .name = "global-env", .key = 'G',
331
377
.arg = "VAR=value",
332
378
.doc = "Environment variable passed to all plugins" },
333
379
{ .name = "options-for", .key = 'o',
334
380
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
381
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
382
{ .name = "env-for", .key = 'E',
337
383
.arg = "PLUGIN:ENV=value",
338
384
.doc = "Environment variable passed to specified plugin" },
339
385
{ .name = "disable", .key = 'd',
341
387
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
390
.doc = "Enable a specific plugin", .group = 1 },
342
391
{ .name = "plugin-dir", .key = 128,
343
392
.arg = "DIRECTORY",
344
393
.doc = "Specify a different plugin directory", .group = 2 },
353
402
.doc = "Group ID the plugins will run as", .group = 3 },
354
403
{ .name = "debug", .key = 132,
355
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 },
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
363
422
case 'g': /* --global-options */
366
while((p = strsep(&arg, ",")) != NULL){
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
377
case 'e': /* --global-envs */
382
char *envdef = strdup(arg);
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
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);
391
435
case 'o': /* --options-for */
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
397
char *opt = strsep(&arg, ":");
403
while((p = strsep(&opt, ",")) != NULL){
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
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)){
415
case 'f': /* --envs-for */
458
case 'E': /* --env-for */
420
460
char *envdef = strchr(arg, ':');
421
461
if(envdef == NULL){
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
462
argp_error(state, "No colon in \"%s\"", arg);
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
469
argp_error(state, "Empty plugin name");
473
add_environment(getplugin(arg), envdef, true);
434
476
case 'd': /* --disable */
436
plugin *p = getplugin(arg);
438
return ARGP_ERR_UNKNOWN;
478
plugin *p = getplugin(arg);
484
case 'e': /* --enable */
486
plugin *p = getplugin(arg);
443
492
case 128: /* --plugin-dir */
444
494
plugindir = strdup(arg);
445
if(plugindir == NULL){
449
case 129: /* --config-file */
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 */
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 */
450
570
argfile = strdup(arg);
455
572
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
458
573
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
461
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
464
578
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
470
581
return ARGP_ERR_UNKNOWN;
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
477
589
.doc = "Mandos plugin runner -- Run plugins" };
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
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;
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
613
/* Open the configfile if available */
488
615
conffp = fopen(AFILE, "r");
490
617
conffp = fopen(argfile, "r");
492
619
if(conffp != NULL){
493
620
char *org_line = NULL;
494
621
char *p, *arg, *new_arg, *line;
497
623
const char whitespace_delims[] = " \r\t\f\v\n";
498
624
const char comment_delim[] = "#";
501
627
custom_argv = malloc(sizeof(char*) * 2);
502
628
if(custom_argv == NULL){
503
629
perror("malloc");
504
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
507
633
custom_argv[0] = argv[0];
508
634
custom_argv[1] = NULL;
510
/* for each line in the config file, strip whitespace and ignore commented text */
636
/* for each line in the config file, strip whitespace and ignore
512
639
sret = getline(&org_line, &size, conffp);
518
645
arg = strsep(&line, comment_delim);
519
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
533
660
* ((unsigned int) custom_argc + 1));
534
661
if(custom_argv == NULL){
535
662
perror("realloc");
536
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
540
667
custom_argv[custom_argc-1] = new_arg;
541
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;
546
681
/* Check for harmful errors and go to fallback. Other errors might
547
682
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
550
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_OSERR;
554
/* If there was any arguments from configuration file,
555
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 */
556
691
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
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;
710
/* Parse actual command line arguments, to let them override the
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;
566
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
567
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
569
733
for(char **a = p->argv; *a != NULL; a++){
570
734
fprintf(stderr, "\tArg: %s\n", *a);
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
737
for(char **a = p->environ; *a != NULL; a++){
574
738
fprintf(stderr, "\t%s\n", *a);
579
743
/* Strip permissions down to nobody */
580
748
ret = setuid(uid);
582
750
perror("setuid");
589
if (plugindir == NULL){
592
dir = opendir(plugindir);
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
/* Open plugin directory with close_on_exec flag */
603
int dir_fd = dirfd(dir);
605
ret = set_cloexec_flag(dir_fd);
607
perror("set_cloexec_flag");
608
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;
614
799
FD_ZERO(&rfds_all);
616
801
/* Read and execute any executable in the plugin directory*/
618
dirst = readdir(dir);
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
620
// All directory entries have been processed
807
/* All directory entries have been processed */
621
808
if(dirst == NULL){
623
810
perror("readdir");
624
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
861
1063
free_plugin_list();
865
1067
/* Main loop while running plugins exist */
866
1068
while(plugin_list){
867
1069
fd_set rfds = rfds_all;
868
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
870
1072
perror("select");
871
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
874
1076
/* OK, now either a process completed, or something can be read
875
1077
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1078
for(plugin *proc = plugin_list; proc != NULL;){
877
1079
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
879
1081
/* Only accept the plugin output if it exited cleanly */
880
1082
if(not WIFEXITED(proc->status)
881
1083
or WEXITSTATUS(proc->status) != 0){
882
1084
/* Bad exit by plugin */
885
1087
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
888
1091
WEXITSTATUS(proc->status));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
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)));
893
1098
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
899
1104
/* Remove the plugin */
900
FD_CLR(proc->fd, &rfds_all);
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
902
1108
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
&sigchld_action.sa_mask,
905
1114
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1115
exitstatus = EX_OSERR;
1119
plugin *next_plugin = proc->next;
909
1120
free_plugin(proc);
910
1123
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
914
1128
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
1129
exitstatus = EX_OSERR;
919
1133
if(plugin_list == NULL){
925
1140
/* This process exited nicely, so print its buffer */
927
1142
bool bret = print_out_password(proc->buffer,
928
1143
proc->buffer_length);
930
1145
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
936
1151
/* This process has not completed. Does it have any output? */
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
938
1155
/* This process had nothing to say at this time */
941
1159
/* Before reading, make the process' data buffer large enough */
942
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
1162
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
1163
if(proc->buffer == NULL){
946
1164
perror("malloc");
947
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
950
1168
proc->buffer_size += BUFFER_SIZE;
952
1170
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1173
+ proc->buffer_length,
956
1176
/* Read error from this process; ignore the error */
961
1182
proc->eof = true;
963
proc->buffer_length += (size_t) ret;
1184
proc->buffer_length += (size_t) sret;
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
972
1194
/* Fallback if all plugins failed, none are found or an error
975
1197
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
1198
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
979
1207
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;