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(),
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,
61
58
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
60
#include <signal.h> /* struct sigaction, sigemptyset(),
65
61
sigaddset(), sigaction(),
66
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
63
SIG_UNBLOCK, kill() */
69
64
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
74
66
#define BUFFER_SIZE 256
76
#define PDIR "/lib/mandos/plugins.d"
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
79
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
const char *argp_program_version = "plugin-runner 1.0";
80
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
typedef struct process{
82
86
typedef struct plugin{
83
87
char *name; /* can be NULL or any plugin name */
207
170
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
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);
232
175
return add_to_char_array(def, &(p->environ), &(p->envc));
236
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
181
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
184
static int set_cloexec_flag(int fd)
186
int ret = fcntl(fd, F_GETFD, 0);
242
187
/* If reading the flags failed, return error indication now. */
246
191
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
195
process *process_list = NULL;
252
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
257
plugin *proc = plugin_list;
259
pid_t pid = waitpid(-1, &status, WNOHANG);
261
/* Only still running child processes */
266
/* No child processes */
272
/* A child exited, find it in process_list */
273
while(proc != NULL and proc->pid != pid){
277
/* Process not found in process list */
280
proc->status = status;
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
202
pid_t pid = wait(&status);
207
while(proc != NULL and proc->pid != pid){
211
/* Process not found in process list */
214
proc->status = status;
215
proc->completed = true;
286
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
220
if(length>0 and buffer[length-1] == '\n'){
289
223
for(size_t written = 0; written < length; written += (size_t)ret){
290
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
225
length - written));
373
307
{ .name = "global-options", .key = 'g',
374
308
.arg = "OPTION[,OPTION[,...]]",
375
309
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
377
311
.arg = "VAR=value",
378
312
.doc = "Environment variable passed to all plugins" },
379
313
{ .name = "options-for", .key = 'o',
380
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
315
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
383
317
.arg = "PLUGIN:ENV=value",
384
318
.doc = "Environment variable passed to specified plugin" },
385
319
{ .name = "disable", .key = 'd',
387
321
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
390
.doc = "Enable a specific plugin", .group = 1 },
391
322
{ .name = "plugin-dir", .key = 128,
392
323
.arg = "DIRECTORY",
393
324
.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 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.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 */
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
344
while((p = strsep(&arg, ",")) != NULL){
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
360
char *envdef = strdup(arg);
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
375
char *opt = strsep(&arg, ":");
381
while((p = strsep(&opt, ",")) != NULL){
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
460
398
char *envdef = strchr(arg, ':');
461
399
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
402
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 */
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
414
plugin *p = getplugin(arg, plugins);
416
return ARGP_ERR_UNKNOWN;
425
uid = (uid_t)strtol(arg, NULL, 10);
428
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,
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
return ARGP_ERR_UNKNOWN;
444
plugin *plugin_list = NULL;
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
589
448
.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");
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
452
fprintf(stderr, "Unknown error while parsing arguments\n");
453
exitstatus = EXIT_FAILURE;
457
conffp = fopen(argfile, "r");
619
458
if(conffp != NULL){
620
459
char *org_line = NULL;
621
460
char *p, *arg, *new_arg, *line;
623
463
const char whitespace_delims[] = " \r\t\f\v\n";
624
464
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
467
sret = getline(&org_line, &size, conffp);
645
473
arg = strsep(&line, comment_delim);
646
474
while((p = strsep(&arg, whitespace_delims)) != NULL){
1000
740
if(p->environ[0] == NULL){
1001
741
if(execv(filename, p->argv) < 0){
1002
742
perror("execv");
1006
746
if(execve(filename, p->argv, p->environ) < 0){
1007
747
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,
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1024
perror("sigprocmask");
761
perror("sigprocmask");
1026
exitstatus = EX_OSERR;
763
exitstatus = EXIT_FAILURE;
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
767
*new_process = (struct process){ .pid = pid,
769
.next = process_list };
771
process_list = new_process;
1033
772
/* Unblock SIGCHLD so signal handler can be run if this process
1034
773
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1039
776
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
777
exitstatus = EXIT_FAILURE;
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
781
FD_SET(new_process->fd, &rfds_all);
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
1052
TEMP_FAILURE_RETRY(closedir(dir));
789
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"
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1067
/* Main loop while running plugins exist */
1069
800
fd_set rfds = rfds_all;
1070
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
802
if (select_ret == -1){
1072
803
perror("select");
1073
exitstatus = EX_OSERR;
804
exitstatus = EXIT_FAILURE;
1076
807
/* OK, now either a process completed, or something can be read
1077
808
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
1079
810
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
811
if(proc->eof and proc->completed){
1081
812
/* Only accept the plugin output if it exited cleanly */
1082
813
if(not WIFEXITED(proc->status)
1083
814
or WEXITSTATUS(proc->status) != 0){
1084
815
/* Bad exit by plugin */
1087
817
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
1091
820
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)));
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
824
WTERMSIG(proc->status));
1098
825
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
1104
830
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
831
FD_CLR(proc->fd, &rfds_all);
1108
832
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
&sigchld_action.sa_mask,
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1114
835
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
836
exitstatus = EXIT_FAILURE;
1119
plugin *next_plugin = proc->next;
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
847
p->next = proc->next;
1123
852
/* 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)));
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1128
856
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1133
if(plugin_list == NULL){
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
1140
865
/* This process exited nicely, so print its buffer */
1142
bool bret = print_out_password(proc->buffer,
1143
proc->buffer_length);
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1145
869
perror("print_out_password");
1146
exitstatus = EX_IOERR;
870
exitstatus = EXIT_FAILURE;
1151
874
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
876
/* This process had nothing to say at this time */
1159
879
/* Before reading, make the process' data buffer large enough */
1160
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
882
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
883
if (proc->buffer == NULL){
1164
884
perror("malloc");
1165
exitstatus = EX_OSERR;
885
exitstatus = EXIT_FAILURE;
1168
888
proc->buffer_size += BUFFER_SIZE;
1170
890
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1173
+ proc->buffer_length,
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1176
894
/* Read error from this process; ignore the error */
1182
899
proc->eof = true;
1184
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1194
/* Fallback if all plugins failed, none are found or an error
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1197
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
913
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);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1207
916
perror("print_out_password");
1208
exitstatus = EX_IOERR;
917
exitstatus = EXIT_FAILURE;