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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:35:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113043519-0yr39snphoegq8l1
* plugin-runner.c: Only space changes.
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- files removed:
- DBUS-API
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- INSTALL
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#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 */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
67
76
68
#define BUFFER_SIZE 256
77
69
88
80
char **environ;
89
81
int envc;
90
82
bool disabled;
91
83
92
84
/* Variables used for running processes*/
93
85
pid_t pid;
94
86
int fd;
96
88
size_t buffer_size;
97
89
size_t buffer_length;
98
90
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
91
volatile bool completed;
92
volatile int status;
101
93
struct plugin *next;
102
94
} plugin;
103
95
106
98
/* Gets an existing plugin based on name,
107
99
or if none is found, creates a new one */
108
100
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
101
/* Check for exiting plugin with that name */
110
102
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
103
if((p->name == name)
112
104
or (p->name and name and (strcmp(p->name, name) == 0))){
114
106
}
115
107
}
116
108
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
109
plugin *new_plugin = malloc(sizeof(plugin));
121
110
if(new_plugin == NULL){
122
111
return NULL;
123
112
}
124
113
char *copy_name = NULL;
125
114
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
129
116
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
117
return NULL;
134
118
}
135
119
}
136
120
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
141
125
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
126
new_plugin->argv = malloc(sizeof(char *) * 2);
145
127
if(new_plugin->argv == NULL){
146
int e = errno;
147
128
free(copy_name);
148
129
free(new_plugin);
149
errno = e;
150
130
return NULL;
151
131
}
152
132
new_plugin->argv[0] = copy_name;
153
133
new_plugin->argv[1] = NULL;
154
134
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
158
136
if(new_plugin->environ == NULL){
159
int e = errno;
160
137
free(copy_name);
161
138
free(new_plugin->argv);
162
139
free(new_plugin);
163
errno = e;
164
140
return NULL;
165
141
}
166
142
new_plugin->environ[0] = NULL;
174
150
static bool add_to_char_array(const char *new, char ***array,
175
151
int *len){
176
152
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
181
155
/* Malloc check */
182
156
if(*array == NULL){
183
157
return false;
184
158
}
185
159
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
190
161
if(copy == NULL){
191
162
return false;
192
163
}
218
189
if(strncmp(*e, def, namelen + 1) == 0){
219
190
/* It already exists */
220
191
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
192
char *new = realloc(*e, strlen(def) + 1);
225
193
if(new == NULL){
226
194
return false;
227
195
}
237
205
/*
238
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
207
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
209
*/
242
210
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
244
212
/* If reading the flags failed, return error indication now. */
245
213
if(ret < 0){
246
214
return ret;
247
215
}
248
216
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
218
}
252
219
253
220
254
221
/* Mark processes as completed when they exit, and save their exit
255
222
status. */
256
223
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
258
224
while(true){
259
225
plugin *proc = plugin_list;
260
226
int status;
264
230
break;
265
231
}
266
232
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
233
if(errno != ECHILD){
234
perror("waitpid");
270
235
}
271
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
272
238
}
273
239
274
240
/* A child exited, find it in process_list */
280
246
continue;
281
247
}
282
248
proc->status = status;
283
proc->completed = 1;
249
proc->completed = true;
284
250
}
285
errno = old_errno;
286
251
}
287
252
288
253
/* Prints out a password to stdout */
310
275
}
311
276
free(plugin_node->environ);
312
277
free(plugin_node->buffer);
313
278
314
279
/* Removes the plugin from the singly-linked list */
315
280
if(plugin_node == plugin_list){
316
281
/* First one - simple */
359
324
sigemptyset(&sigchld_action.sa_mask);
360
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
326
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
364
329
goto fallback;
365
330
}
366
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
332
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
370
335
goto fallback;
371
336
}
372
337
404
369
.doc = "Group ID the plugins will run as", .group = 3 },
405
370
{ .name = "debug", .key = 132,
406
371
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
372
{ .name = NULL }
417
373
};
418
374
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
424
378
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
379
if(arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
430
388
}
431
389
}
432
390
}
433
391
break;
434
392
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
436
399
break;
437
400
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
401
if(arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
456
418
}
457
419
}
458
420
}
459
421
break;
460
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
461
426
{
462
427
char *envdef = strchr(arg, ':');
463
428
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
429
break;
467
430
}
468
431
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
474
434
}
475
add_environment(getplugin(arg), envdef, true);
476
435
}
477
436
break;
478
437
case 'd': /* --disable */
479
{
438
if(arg != NULL){
480
439
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
483
442
}
443
p->disabled = true;
484
444
}
485
445
break;
486
446
case 'e': /* --enable */
487
{
447
if(arg != NULL){
488
448
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
491
451
}
452
p->disabled = false;
492
453
}
493
454
break;
494
455
case 128: /* --plugin-dir */
495
456
free(plugindir);
496
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
497
461
break;
498
462
case 129: /* --config-file */
499
463
/* This is already done by parse_opt_config_file() */
500
464
break;
501
465
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
508
471
}
509
uid = (uid_t)tmpmax;
510
472
break;
511
473
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
518
479
}
519
gid = (gid_t)tmpmax;
520
480
break;
521
481
case 132: /* --debug */
522
482
debug = true;
523
483
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
484
/*
539
485
* When adding more options before this line, remember to also add a
540
486
* "case" to the "parse_opt_config_file" function below.
543
489
/* Cryptsetup always passes an argument, which is an empty
544
490
string if "none" was specified in /etc/crypttab. So if
545
491
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
549
498
default:
550
499
return ARGP_ERR_UNKNOWN;
551
500
}
552
return errno; /* Set to 0 at start */
501
return 0;
553
502
}
554
503
555
504
/* This option parser is the same as parse_opt() above, except it
556
505
ignores everything but the --config-file option. */
557
506
error_t parse_opt_config_file(int key, char *arg,
558
507
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
508
struct argp_state *state) {
509
switch(key) {
562
510
case 'g': /* --global-options */
563
511
case 'G': /* --global-env */
564
512
case 'o': /* --options-for */
570
518
case 129: /* --config-file */
571
519
free(argfile);
572
520
argfile = strdup(arg);
573
break;
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
574
525
case 130: /* --userid */
575
526
case 131: /* --groupid */
576
527
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
528
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
581
530
break;
582
531
default:
583
532
return ARGP_ERR_UNKNOWN;
584
533
}
585
return errno;
534
return 0;
586
535
}
587
536
588
537
struct argp argp = { .options = options,
592
541
593
542
/* Parse using parse_opt_config_file() in order to get the custom
594
543
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
exitstatus = EXIT_FAILURE;
609
548
goto fallback;
610
549
}
611
550
617
556
conffp = fopen(AFILE, "r");
618
557
} else {
619
558
conffp = fopen(argfile, "r");
620
}
559
}
621
560
if(conffp != NULL){
622
561
char *org_line = NULL;
623
562
char *p, *arg, *new_arg, *line;
624
563
size_t size = 0;
625
564
const char whitespace_delims[] = " \r\t\f\v\n";
626
565
const char comment_delim[] = "#";
627
566
628
567
custom_argc = 1;
629
568
custom_argv = malloc(sizeof(char*) * 2);
630
569
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
633
572
goto fallback;
634
573
}
635
574
custom_argv[0] = argv[0];
636
575
custom_argv[1] = NULL;
637
576
638
577
/* for each line in the config file, strip whitespace and ignore
639
578
commented text */
640
579
while(true){
642
581
if(sret == -1){
643
582
break;
644
583
}
645
584
646
585
line = org_line;
647
586
arg = strsep(&line, comment_delim);
648
587
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
590
}
652
591
new_arg = strdup(p);
653
592
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
656
595
free(org_line);
657
596
goto fallback;
658
597
}
661
600
custom_argv = realloc(custom_argv, sizeof(char *)
662
601
* ((unsigned int) custom_argc + 1));
663
602
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
666
605
free(org_line);
667
606
goto fallback;
668
607
}
669
608
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
609
custom_argv[custom_argc] = NULL;
671
610
}
672
611
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
612
free(org_line);
682
613
} else {
683
614
/* Check for harmful errors and go to fallback. Other errors might
684
615
not affect opening plugins */
685
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
617
perror("fopen");
618
exitstatus = EXIT_FAILURE;
688
619
goto fallback;
689
620
}
690
621
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
693
624
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
708
630
goto fallback;
709
631
}
710
632
}
711
633
712
634
/* Parse actual command line arguments, to let them override the
713
635
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
728
640
goto fallback;
729
641
}
730
642
735
647
for(char **a = p->argv; *a != NULL; a++){
736
648
fprintf(stderr, "\tArg: %s\n", *a);
737
649
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
739
651
for(char **a = p->environ; *a != NULL; a++){
740
652
fprintf(stderr, "\t%s\n", *a);
741
653
}
743
655
}
744
656
745
657
/* Strip permissions down to nobody */
658
ret = setuid(uid);
659
if(ret == -1){
660
perror("setuid");
661
}
746
662
setgid(gid);
747
663
if(ret == -1){
748
error(0, errno, "setgid");
749
}
750
ret = setuid(uid);
751
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
664
perror("setgid");
665
}
666
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
673
if(dir == NULL){
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
756
680
{
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
681
int dir_fd = dirfd(dir);
682
if(dir_fd >= 0){
683
ret = set_cloexec_flag(dir_fd);
684
if(ret < 0){
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
687
goto fallback;
688
}
798
689
}
799
690
}
800
691
802
693
803
694
/* Read and execute any executable in the plugin directory*/
804
695
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
696
dirst = readdir(dir);
808
697
809
698
/* All directory entries have been processed */
810
699
if(dirst == NULL){
811
700
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
701
perror("readdir");
702
exitstatus = EXIT_FAILURE;
814
703
goto fallback;
815
704
}
816
705
break;
846
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
736
size_t suf_len = strlen(*suf);
848
737
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
738
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
739
== 0)){
851
740
if(debug){
852
741
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
861
750
continue;
862
751
}
863
752
}
864
753
865
754
char *filename;
866
755
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
869
757
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
873
759
}
874
760
if(ret < 0){
875
error(0, errno, "asprintf");
761
perror("asprintf");
876
762
continue;
877
763
}
878
764
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
765
ret = stat(filename, &st);
880
766
if(ret == -1){
881
error(0, errno, "stat");
767
perror("stat");
882
768
free(filename);
883
769
continue;
884
770
}
885
771
886
772
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
889
774
if(debug){
890
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
776
" with bad type or mode\n", filename);
896
781
897
782
plugin *p = getplugin(dirst->d_name);
898
783
if(p == NULL){
899
error(0, errno, "getplugin");
784
perror("getplugin");
900
785
free(filename);
901
786
continue;
902
787
}
914
799
if(g != NULL){
915
800
for(char **a = g->argv + 1; *a != NULL; a++){
916
801
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
802
perror("add_argument");
918
803
}
919
804
}
920
805
/* Add global environment variables */
921
806
for(char **e = g->environ; *e != NULL; e++){
922
807
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
808
perror("add_environment");
924
809
}
925
810
}
926
811
}
931
816
if(p->environ[0] != NULL){
932
817
for(char **e = environ; *e != NULL; e++){
933
818
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
819
perror("add_environment");
935
820
}
936
821
}
937
822
}
938
823
939
824
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
825
ret = pipe(pipefd);
941
826
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
827
perror("pipe");
828
exitstatus = EXIT_FAILURE;
944
829
goto fallback;
945
830
}
946
831
/* Ask OS to automatic close the pipe on exec */
947
832
ret = set_cloexec_flag(pipefd[0]);
948
833
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
834
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
951
836
goto fallback;
952
837
}
953
838
ret = set_cloexec_flag(pipefd[1]);
954
839
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
957
842
goto fallback;
958
843
}
959
844
/* Block SIGCHLD until process is safely in process list */
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
846
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
847
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
966
849
goto fallback;
967
850
}
968
851
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
852
pid_t pid = fork();
973
853
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
854
perror("fork");
855
exitstatus = EXIT_FAILURE;
976
856
goto fallback;
977
857
}
978
858
if(pid == 0){
979
859
/* this is the child process */
980
860
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
861
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
862
perror("sigaction");
863
_exit(EXIT_FAILURE);
984
864
}
985
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
866
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
867
perror("sigprocmask");
868
_exit(EXIT_FAILURE);
989
869
}
990
870
991
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
872
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
873
perror("dup2");
874
_exit(EXIT_FAILURE);
995
875
}
996
876
997
877
if(dirfd(dir) < 0){
1001
881
}
1002
882
if(p->environ[0] == NULL){
1003
883
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
884
perror("execv");
885
_exit(EXIT_FAILURE);
1006
886
}
1007
887
} else {
1008
888
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
889
perror("execve");
890
_exit(EXIT_FAILURE);
1011
891
}
1012
892
}
1013
893
/* no return */
1014
894
}
1015
895
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
896
close(pipefd[1]); /* Close unused write end of pipe */
1018
897
free(filename);
1019
898
plugin *new_plugin = getplugin(dirst->d_name);
1020
899
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
900
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
902
if(ret < 0){
1026
error(0, errno, "sigprocmask");
903
perror("sigprocmask");
1027
904
}
1028
exitstatus = EX_OSERR;
905
exitstatus = EXIT_FAILURE;
1029
906
goto fallback;
1030
907
}
1031
908
1034
911
1035
912
/* Unblock SIGCHLD so signal handler can be run if this process
1036
913
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1040
915
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1043
918
goto fallback;
1044
919
}
1045
920
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
921
FD_SET(new_plugin->fd, &rfds_all);
1048
922
1049
923
if(maxfd < new_plugin->fd){
1050
924
maxfd = new_plugin->fd;
1051
925
}
1052
926
}
1053
927
1054
TEMP_FAILURE_RETRY(closedir(dir));
928
closedir(dir);
1055
929
dir = NULL;
1056
free_plugin(getplugin(NULL));
1057
930
1058
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
1059
932
if(p->pid != 0){
1070
943
while(plugin_list){
1071
944
fd_set rfds = rfds_all;
1072
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
946
if(select_ret == -1){
947
perror("select");
948
exitstatus = EXIT_FAILURE;
1076
949
goto fallback;
1077
950
}
1078
951
/* OK, now either a process completed, or something can be read
1079
952
from one of them */
1080
953
for(plugin *proc = plugin_list; proc != NULL;){
1081
954
/* Is this process completely done? */
1082
if(proc->completed and proc->eof){
955
if(proc->eof and proc->completed){
1083
956
/* Only accept the plugin output if it exited cleanly */
1084
957
if(not WIFEXITED(proc->status)
1085
958
or WEXITSTATUS(proc->status) != 0){
1086
959
/* Bad exit by plugin */
1087
960
1088
961
if(debug){
1089
962
if(WIFEXITED(proc->status)){
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1093
965
WEXITSTATUS(proc->status));
1094
} else if(WIFSIGNALED(proc->status)){
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1100
970
} else if(WCOREDUMP(proc->status)){
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1103
973
}
1104
974
}
1105
975
1106
976
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
977
FD_CLR(proc->fd, &rfds_all);
978
1110
979
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1115
981
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1118
984
goto fallback;
1119
985
}
1120
986
1123
989
proc = next_plugin;
1124
990
1125
991
/* We are done modifying process list, so unblock signal */
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1129
994
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
995
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
1132
997
goto fallback;
1133
998
}
1134
999
1144
1009
bool bret = print_out_password(proc->buffer,
1145
1010
proc->buffer_length);
1146
1011
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1012
perror("print_out_password");
1013
exitstatus = EXIT_FAILURE;
1149
1014
}
1150
1015
goto fallback;
1151
1016
}
1152
1017
1153
1018
/* This process has not completed. Does it have any output? */
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1020
/* This process had nothing to say at this time */
1158
1021
proc = proc->next;
1159
1022
continue;
1163
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
1027
+ (size_t) BUFFER_SIZE);
1165
1028
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1029
perror("malloc");
1030
exitstatus = EXIT_FAILURE;
1168
1031
goto fallback;
1169
1032
}
1170
1033
proc->buffer_size += BUFFER_SIZE;
1171
1034
}
1172
1035
/* Read from the process */
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1177
1038
if(sret < 0){
1178
1039
/* Read error from this process; ignore the error */
1179
1040
proc = proc->next;
1187
1048
}
1188
1049
}
1189
1050
}
1190
1191
1051
1052
1192
1053
fallback:
1193
1054
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1196
1056
/* Fallback if all plugins failed, none are found or an error
1197
1057
occured */
1198
1058
bool bret;
1206
1066
}
1207
1067
bret = print_out_password(passwordbuffer, len);
1208
1068
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1069
perror("print_out_password");
1070
exitstatus = EXIT_FAILURE;
1211
1071
}
1212
1072
}
1213
1073
1214
1074
/* Restore old signal handler */
1215
1075
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
1076
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1077
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1219
1079
}
1220
1080
1221
1081
if(custom_argv != NULL){
1236
1096
ret = kill(p->pid, SIGTERM);
1237
1097
if(ret == -1 and errno != ESRCH){
1238
1098
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1099
perror("kill");
1240
1100
}
1241
1101
}
1242
1102
}
1243
1103
1244
1104
/* Wait for any remaining child processes to terminate */
1245
do {
1105
do{
1246
1106
ret = wait(NULL);
1247
1107
} while(ret >= 0);
1248
1108
if(errno != ECHILD){
1249
error(0, errno, "wait");
1109
perror("wait");
1250
1110
}
1251
1111
1252
1112
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0