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- Committer: Björn Påhlsson
- Date: 2009-01-10 21:49:25 UTC
- mfrom: (262 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090110214925-f0y2sjhb0br4nexb
merge
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 */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
113
105
return p;
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);
121
if(new_plugin == NULL){
109
plugin *new_plugin = malloc(sizeof(plugin));
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);
145
if(new_plugin->argv == NULL){
146
int e = errno;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
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;
508
}
509
uid = (uid_t)tmpmax;
466
uid = (uid_t)strtol(arg, NULL, 10);
510
467
break;
511
468
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;
518
}
519
gid = (gid_t)tmpmax;
469
gid = (gid_t)strtol(arg, NULL, 10);
520
470
break;
521
471
case 132: /* --debug */
522
472
debug = true;
523
473
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
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
474
case ARGP_KEY_ARG:
543
475
/* Cryptsetup always passes an argument, which is an empty
544
476
string if "none" was specified in /etc/crypttab. So if
545
477
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
549
484
default:
550
485
return ARGP_ERR_UNKNOWN;
551
486
}
552
return errno; /* Set to 0 at start */
487
return 0;
553
488
}
554
489
555
490
/* This option parser is the same as parse_opt() above, except it
556
491
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
562
496
case 'g': /* --global-options */
563
497
case 'G': /* --global-env */
564
498
case 'o': /* --options-for */
570
504
case 129: /* --config-file */
571
505
free(argfile);
572
506
argfile = strdup(arg);
573
break;
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
574
511
case 130: /* --userid */
575
512
case 131: /* --groupid */
576
513
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
581
516
break;
582
517
default:
583
518
return ARGP_ERR_UNKNOWN;
584
519
}
585
return errno;
520
return 0;
586
521
}
587
522
588
523
struct argp argp = { .options = options,
590
525
.args_doc = "",
591
526
.doc = "Mandos plugin runner -- Run plugins" };
592
527
593
/* Parse using parse_opt_config_file() in order to get the custom
528
/* Parse using the parse_opt_config_file in order to get the custom
594
529
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;
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
609
534
goto fallback;
610
535
}
611
536
613
538
argp.parser = parse_opt;
614
539
615
540
/* Open the configfile if available */
616
if(argfile == NULL){
541
if (argfile == NULL){
617
542
conffp = fopen(AFILE, "r");
618
543
} else {
619
544
conffp = fopen(argfile, "r");
620
}
545
}
621
546
if(conffp != NULL){
622
547
char *org_line = NULL;
623
548
char *p, *arg, *new_arg, *line;
624
549
size_t size = 0;
625
550
const char whitespace_delims[] = " \r\t\f\v\n";
626
551
const char comment_delim[] = "#";
627
552
628
553
custom_argc = 1;
629
554
custom_argv = malloc(sizeof(char*) * 2);
630
555
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
633
558
goto fallback;
634
559
}
635
560
custom_argv[0] = argv[0];
636
561
custom_argv[1] = NULL;
637
562
638
563
/* for each line in the config file, strip whitespace and ignore
639
564
commented text */
640
565
while(true){
642
567
if(sret == -1){
643
568
break;
644
569
}
645
570
646
571
line = org_line;
647
572
arg = strsep(&line, comment_delim);
648
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
576
}
652
577
new_arg = strdup(p);
653
578
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
656
581
free(org_line);
657
582
goto fallback;
658
583
}
661
586
custom_argv = realloc(custom_argv, sizeof(char *)
662
587
* ((unsigned int) custom_argc + 1));
663
588
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
666
591
free(org_line);
667
592
goto fallback;
668
593
}
669
594
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
671
596
}
672
597
}
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
598
free(org_line);
682
599
} else {
683
600
/* Check for harmful errors and go to fallback. Other errors might
684
601
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
688
605
goto fallback;
689
606
}
690
607
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
693
610
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;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
708
616
goto fallback;
709
617
}
710
618
}
711
619
712
620
/* Parse actual command line arguments, to let them override the
713
621
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;
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
728
626
goto fallback;
729
627
}
730
628
735
633
for(char **a = p->argv; *a != NULL; a++){
736
634
fprintf(stderr, "\tArg: %s\n", *a);
737
635
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
739
637
for(char **a = p->environ; *a != NULL; a++){
740
638
fprintf(stderr, "\t%s\n", *a);
741
639
}
743
641
}
744
642
745
643
/* Strip permissions down to nobody */
644
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
746
648
setgid(gid);
747
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 */
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
756
666
{
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;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
798
675
}
799
676
}
800
677
802
679
803
680
/* Read and execute any executable in the plugin directory*/
804
681
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
682
dirst = readdir(dir);
808
683
809
684
/* All directory entries have been processed */
810
685
if(dirst == NULL){
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
814
689
goto fallback;
815
690
}
816
691
break;
846
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
722
size_t suf_len = strlen(*suf);
848
723
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
725
== 0)){
851
726
if(debug){
852
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
861
736
continue;
862
737
}
863
738
}
864
739
865
740
char *filename;
866
741
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
869
743
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
873
745
}
874
746
if(ret < 0){
875
error(0, errno, "asprintf");
747
perror("asprintf");
876
748
continue;
877
749
}
878
750
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
if(ret == -1){
881
error(0, errno, "stat");
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
882
754
free(filename);
883
755
continue;
884
756
}
885
757
886
758
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
889
760
if(debug){
890
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
762
" with bad type or mode\n", filename);
896
767
897
768
plugin *p = getplugin(dirst->d_name);
898
769
if(p == NULL){
899
error(0, errno, "getplugin");
770
perror("getplugin");
900
771
free(filename);
901
772
continue;
902
773
}
914
785
if(g != NULL){
915
786
for(char **a = g->argv + 1; *a != NULL; a++){
916
787
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
788
perror("add_argument");
918
789
}
919
790
}
920
791
/* Add global environment variables */
921
792
for(char **e = g->environ; *e != NULL; e++){
922
793
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
794
perror("add_environment");
924
795
}
925
796
}
926
797
}
931
802
if(p->environ[0] != NULL){
932
803
for(char **e = environ; *e != NULL; e++){
933
804
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
805
perror("add_environment");
935
806
}
936
807
}
937
808
}
938
809
939
810
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
944
815
goto fallback;
945
816
}
946
817
/* Ask OS to automatic close the pipe on exec */
947
818
ret = set_cloexec_flag(pipefd[0]);
948
819
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
951
822
goto fallback;
952
823
}
953
824
ret = set_cloexec_flag(pipefd[1]);
954
825
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
957
828
goto fallback;
958
829
}
959
830
/* 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));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
832
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
966
835
goto fallback;
967
836
}
968
837
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
973
839
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
976
842
goto fallback;
977
843
}
978
844
if(pid == 0){
979
845
/* this is the child process */
980
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
847
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
984
850
}
985
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
852
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
989
855
}
990
856
991
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
858
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
995
861
}
996
862
997
863
if(dirfd(dir) < 0){
1001
867
}
1002
868
if(p->environ[0] == NULL){
1003
869
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
870
perror("execv");
871
_exit(EXIT_FAILURE);
1006
872
}
1007
873
} else {
1008
874
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
875
perror("execve");
876
_exit(EXIT_FAILURE);
1011
877
}
1012
878
}
1013
879
/* no return */
1014
880
}
1015
881
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
882
close(pipefd[1]); /* Close unused write end of pipe */
1018
883
free(filename);
1019
884
plugin *new_plugin = getplugin(dirst->d_name);
1020
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)));
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
888
if(ret < 0){
1026
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1027
890
}
1028
exitstatus = EX_OSERR;
891
exitstatus = EXIT_FAILURE;
1029
892
goto fallback;
1030
893
}
1031
894
1034
897
1035
898
/* Unblock SIGCHLD so signal handler can be run if this process
1036
899
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1040
901
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1043
904
goto fallback;
1044
905
}
1045
906
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
907
FD_SET(new_plugin->fd, &rfds_all);
1048
908
1049
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1050
910
maxfd = new_plugin->fd;
1051
911
}
1052
912
}
1053
913
1054
TEMP_FAILURE_RETRY(closedir(dir));
914
closedir(dir);
1055
915
dir = NULL;
1056
free_plugin(getplugin(NULL));
1057
916
1058
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1059
918
if(p->pid != 0){
1070
929
while(plugin_list){
1071
930
fd_set rfds = rfds_all;
1072
931
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;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1076
935
goto fallback;
1077
936
}
1078
937
/* OK, now either a process completed, or something can be read
1079
938
from one of them */
1080
939
for(plugin *proc = plugin_list; proc != NULL;){
1081
940
/* Is this process completely done? */
1082
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1083
942
/* Only accept the plugin output if it exited cleanly */
1084
943
if(not WIFEXITED(proc->status)
1085
944
or WEXITSTATUS(proc->status) != 0){
1086
945
/* Bad exit by plugin */
1087
946
1088
947
if(debug){
1089
948
if(WIFEXITED(proc->status)){
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1093
951
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)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
1100
956
} else if(WCOREDUMP(proc->status)){
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1103
959
}
1104
960
}
1105
961
1106
962
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
963
FD_CLR(proc->fd, &rfds_all);
964
1110
965
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1115
967
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1118
970
goto fallback;
1119
971
}
1120
972
1123
975
proc = next_plugin;
1124
976
1125
977
/* 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)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1129
980
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1132
983
goto fallback;
1133
984
}
1134
985
1144
995
bool bret = print_out_password(proc->buffer,
1145
996
proc->buffer_length);
1146
997
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1149
1000
}
1150
1001
goto fallback;
1151
1002
}
1152
1003
1153
1004
/* 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 */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1006
/* This process had nothing to say at this time */
1158
1007
proc = proc->next;
1159
1008
continue;
1162
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1163
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
1013
+ (size_t) BUFFER_SIZE);
1165
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1168
1017
goto fallback;
1169
1018
}
1170
1019
proc->buffer_size += BUFFER_SIZE;
1171
1020
}
1172
1021
/* Read from the process */
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1177
1024
if(sret < 0){
1178
1025
/* Read error from this process; ignore the error */
1179
1026
proc = proc->next;
1187
1034
}
1188
1035
}
1189
1036
}
1190
1191
1037
1038
1192
1039
fallback:
1193
1040
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1196
1042
/* Fallback if all plugins failed, none are found or an error
1197
1043
occured */
1198
1044
bool bret;
1206
1052
}
1207
1053
bret = print_out_password(passwordbuffer, len);
1208
1054
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1211
1057
}
1212
1058
}
1213
1059
1214
1060
/* Restore old signal handler */
1215
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
1062
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1219
1065
}
1220
1066
1221
1067
if(custom_argv != NULL){
1236
1082
ret = kill(p->pid, SIGTERM);
1237
1083
if(ret == -1 and errno != ESRCH){
1238
1084
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1085
perror("kill");
1240
1086
}
1241
1087
}
1242
1088
}
1243
1089
1244
1090
/* Wait for any remaining child processes to terminate */
1245
do {
1091
do{
1246
1092
ret = wait(NULL);
1247
1093
} while(ret >= 0);
1248
1094
if(errno != ECHILD){
1249
error(0, errno, "wait");
1095
perror("wait");
1250
1096
}
1251
1097
1252
1098
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0