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
93
size_t buffer_size;
90
94
size_t buffer_length;
92
volatile bool completed;
96
volatile sig_atomic_t completed;
94
98
struct plugin *next;
97
101
static plugin *plugin_list = NULL;
99
/* Gets a existing plugin based on name,
103
/* Gets an existing plugin based on name,
100
104
or if none is found, creates a new one */
101
105
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))){
106
/* Check for existing plugin with that name */
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
or (p->name and name and (strcmp(p->name, name) == 0))){
109
113
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
114
plugin *new_plugin = NULL;
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
118
if(new_plugin == NULL){
114
121
char *copy_name = NULL;
115
122
if(name != NULL){
116
copy_name = strdup(name);
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
117
126
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){
134
*new_plugin = (plugin){ .name = copy_name,
137
.next = plugin_list };
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
142
if(new_plugin->argv == NULL){
130
145
free(new_plugin);
133
149
new_plugin->argv[0] = copy_name;
134
150
new_plugin->argv[1] = NULL;
136
new_plugin->environ = malloc(sizeof(char *));
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
137
155
if(new_plugin->environ == NULL){
139
158
free(new_plugin->argv);
140
159
free(new_plugin);
143
163
new_plugin->environ[0] = NULL;
145
165
/* Append the new plugin to the list */
146
166
plugin_list = new_plugin;
147
167
return new_plugin;
181
206
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
207
static bool add_environment(plugin *p, const char *def, bool replace){
211
/* namelen = length of name of environment variable */
212
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
216
/* It already exists */
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
186
231
return add_to_char_array(def, &(p->environ), &(p->envc));
190
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
236
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
194
static int set_cloexec_flag(int fd)
196
int ret = fcntl(fd, F_GETFD, 0);
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
197
241
/* If reading the flags failed, return error indication now. */
201
245
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
206
251
/* Mark processes as completed when they exit, and save their exit
208
void handle_sigchld(__attribute__((unused)) int sig){
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
210
256
plugin *proc = plugin_list;
327
372
{ .name = "global-options", .key = 'g',
328
373
.arg = "OPTION[,OPTION[,...]]",
329
374
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
375
{ .name = "global-env", .key = 'G',
331
376
.arg = "VAR=value",
332
377
.doc = "Environment variable passed to all plugins" },
333
378
{ .name = "options-for", .key = 'o',
334
379
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
380
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
381
{ .name = "env-for", .key = 'E',
337
382
.arg = "PLUGIN:ENV=value",
338
383
.doc = "Environment variable passed to specified plugin" },
339
384
{ .name = "disable", .key = 'd',
341
386
.doc = "Disable a specific plugin", .group = 1 },
387
{ .name = "enable", .key = 'e',
389
.doc = "Enable a specific plugin", .group = 1 },
342
390
{ .name = "plugin-dir", .key = 128,
343
391
.arg = "DIRECTORY",
344
392
.doc = "Specify a different plugin directory", .group = 2 },
353
401
.doc = "Group ID the plugins will run as", .group = 3 },
354
402
{ .name = "debug", .key = 132,
355
403
.doc = "Debug mode", .group = 4 },
405
* These reproduce what we would get without ARGP_NO_HELP
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.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. */
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
363
421
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");
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
431
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
391
434
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;
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
445
argp_error(state, "Empty plugin name");
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
415
case 'f': /* --envs-for */
457
case 'E': /* --env-for */
420
459
char *envdef = strchr(arg, ':');
421
460
if(envdef == NULL){
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
461
argp_error(state, "No colon in \"%s\"", arg);
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
468
argp_error(state, "Empty plugin name");
472
add_environment(getplugin(arg), envdef, true);
434
475
case 'd': /* --disable */
436
plugin *p = getplugin(arg);
438
return ARGP_ERR_UNKNOWN;
477
plugin *p = getplugin(arg);
483
case 'e': /* --enable */
485
plugin *p = getplugin(arg);
443
491
case 128: /* --plugin-dir */
444
493
plugindir = strdup(arg);
445
if(plugindir == NULL){
449
case 129: /* --config-file */
495
case 129: /* --config-file */
496
/* This is already done by parse_opt_config_file() */
498
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
508
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
518
case 132: /* --debug */
522
* These reproduce what we would get without ARGP_NO_HELP
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
536
* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
540
/* Cryptsetup always passes an argument, which is an empty
541
string if "none" was specified in /etc/crypttab. So if
542
argument was empty, we ignore it silently. */
547
return ARGP_ERR_UNKNOWN;
549
return errno; /* Set to 0 at start */
552
/* This option parser is the same as parse_opt() above, except it
553
ignores everything but the --config-file option. */
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
559
case 'g': /* --global-options */
560
case 'G': /* --global-env */
561
case 'o': /* --options-for */
562
case 'E': /* --env-for */
563
case 'd': /* --disable */
564
case 'e': /* --enable */
565
case 128: /* --plugin-dir */
567
case 129: /* --config-file */
450
569
argfile = strdup(arg);
455
571
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
458
572
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
461
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
464
577
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
470
580
return ARGP_ERR_UNKNOWN;
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
585
struct argp argp = { .options = options,
586
.parser = parse_opt_config_file,
477
588
.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;
590
/* Parse using parse_opt_config_file() in order to get the custom
591
config file location, if any. */
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
605
exitstatus = EX_USAGE;
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
609
/* Reset to the normal argument parser */
610
argp.parser = parse_opt;
612
/* Open the configfile if available */
488
614
conffp = fopen(AFILE, "r");
490
616
conffp = fopen(argfile, "r");
492
618
if(conffp != NULL){
493
619
char *org_line = NULL;
494
620
char *p, *arg, *new_arg, *line;
497
622
const char whitespace_delims[] = " \r\t\f\v\n";
498
623
const char comment_delim[] = "#";
501
626
custom_argv = malloc(sizeof(char*) * 2);
502
627
if(custom_argv == NULL){
540
666
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
667
custom_argv[custom_argc] = NULL;
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
675
exitstatus = EXIT_FAILURE;
546
680
/* Check for harmful errors and go to fallback. Other errors might
547
681
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
550
684
exitstatus = EXIT_FAILURE;
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
556
690
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;
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
704
exitstatus = EX_CONFIG;
709
/* Parse actual command line arguments, to let them override the
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
724
exitstatus = EX_USAGE;
566
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
567
730
fprintf(stderr, "Plugin: %s has %d arguments\n",
569
732
for(char **a = p->argv; *a != NULL; a++){
570
733
fprintf(stderr, "\tArg: %s\n", *a);
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
736
for(char **a = p->environ; *a != NULL; a++){
574
737
fprintf(stderr, "\t%s\n", *a);
579
742
/* Strip permissions down to nobody */
580
747
ret = setuid(uid);
582
749
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 */
752
/* 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;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
759
#else /* not O_CLOEXEC */
761
#endif /* not O_CLOEXEC */
764
dir_fd = open(plugindir, O_RDONLY |
767
#else /* not O_CLOEXEC */
769
#endif /* not O_CLOEXEC */
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
779
/* Set the FD_CLOEXEC flag on the directory */
780
ret = set_cloexec_flag(dir_fd);
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
787
#endif /* O_CLOEXEC */
789
dir = fdopendir(dir_fd);
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
614
798
FD_ZERO(&rfds_all);
616
800
/* Read and execute any executable in the plugin directory*/
618
dirst = readdir(dir);
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
620
// All directory entries have been processed
806
/* All directory entries have been processed */
621
807
if(dirst == NULL){
623
809
perror("readdir");
624
810
exitstatus = EXIT_FAILURE;
861
1062
free_plugin_list();
865
1066
/* Main loop while running plugins exist */
866
1067
while(plugin_list){
867
1068
fd_set rfds = rfds_all;
868
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
870
1071
perror("select");
871
1072
exitstatus = EXIT_FAILURE;
874
1075
/* OK, now either a process completed, or something can be read
875
1076
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1077
for(plugin *proc = plugin_list; proc != NULL;){
877
1078
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
879
1080
/* Only accept the plugin output if it exited cleanly */
880
1081
if(not WIFEXITED(proc->status)
881
1082
or WEXITSTATUS(proc->status) != 0){
882
1083
/* Bad exit by plugin */
885
1086
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
888
1090
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));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
893
1097
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
899
1103
/* Remove the plugin */
900
FD_CLR(proc->fd, &rfds_all);
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
902
1107
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
&sigchld_action.sa_mask,
905
1113
perror("sigprocmask");
906
1114
exitstatus = EXIT_FAILURE;
1118
plugin *next_plugin = proc->next;
909
1119
free_plugin(proc);
910
1122
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
914
1127
perror("sigprocmask");
915
1128
exitstatus = EXIT_FAILURE;