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- Committer: Teddy Hogeborn
- Date: 2009-11-01 00:10:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20091101001028-hf4mbnoz1yum7bkf
* Makefile (BROKEN_PIE): Add comment.
* debian/rules (BROKEN_PIE): - '' -
* plugin-runner.c: Really always use <sysexits.h> exit codes.
* plugins.d/mandos-client.c: Use <sysexits.h> exit codes.
(start_mandos_communication): Make sure errno is always set when
returning -1.
* debian/rules (BROKEN_PIE): - '' -
* plugin-runner.c: Really always use <sysexits.h> exit codes.
* plugins.d/mandos-client.c: Use <sysexits.h> exit codes.
(start_mandos_communication): Make sure errno is always set when
returning -1.
- files added:
- debian/watch
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- INSTALL
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), 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() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
65
sigaddset(), sigaction(),
64
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
66
69
#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 */
67
73
68
74
#define BUFFER_SIZE 256
69
75
80
86
char **environ;
81
87
int envc;
82
88
bool disabled;
83
89
84
90
/* Variables used for running processes*/
85
91
pid_t pid;
86
92
int fd;
88
94
size_t buffer_size;
89
95
size_t buffer_length;
90
96
bool eof;
91
volatile bool completed;
92
volatile int status;
97
volatile sig_atomic_t completed;
98
int status;
93
99
struct plugin *next;
94
100
} plugin;
95
101
98
104
/* Gets an existing plugin based on name,
99
105
or if none is found, creates a new one */
100
106
static plugin *getplugin(char *name){
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))){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
105
111
return p;
106
112
}
107
113
}
108
114
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
111
120
return NULL;
112
121
}
113
122
char *copy_name = NULL;
114
123
if(name != NULL){
115
copy_name = strdup(name);
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
117
131
return NULL;
118
132
}
119
133
}
120
134
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
125
139
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
128
145
free(copy_name);
129
146
free(new_plugin);
147
errno = e;
130
148
return NULL;
131
149
}
132
150
new_plugin->argv[0] = copy_name;
133
151
new_plugin->argv[1] = NULL;
134
152
135
new_plugin->environ = malloc(sizeof(char *));
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
136
156
if(new_plugin->environ == NULL){
157
int e = errno;
137
158
free(copy_name);
138
159
free(new_plugin->argv);
139
160
free(new_plugin);
161
errno = e;
140
162
return NULL;
141
163
}
142
164
new_plugin->environ[0] = NULL;
150
172
static bool add_to_char_array(const char *new, char ***array,
151
173
int *len){
152
174
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
155
179
/* Malloc check */
156
180
if(*array == NULL){
157
181
return false;
158
182
}
159
183
/* Make a copy of the new string */
160
char *copy = strdup(new);
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
161
188
if(copy == NULL){
162
189
return false;
163
190
}
189
216
if(strncmp(*e, def, namelen + 1) == 0){
190
217
/* It already exists */
191
218
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
193
223
if(new == NULL){
194
224
return false;
195
225
}
205
235
/*
206
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
237
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
239
*/
210
240
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
242
/* If reading the flags failed, return error indication now. */
213
243
if(ret < 0){
214
244
return ret;
215
245
}
216
246
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
218
249
}
219
250
220
251
221
252
/* Mark processes as completed when they exit, and save their exit
222
253
status. */
223
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
224
256
while(true){
225
257
plugin *proc = plugin_list;
226
258
int status;
230
262
break;
231
263
}
232
264
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
235
268
}
236
/* No child processes */
237
break;
269
perror("waitpid");
238
270
}
239
271
240
272
/* A child exited, find it in process_list */
246
278
continue;
247
279
}
248
280
proc->status = status;
249
proc->completed = true;
281
proc->completed = 1;
250
282
}
283
errno = old_errno;
251
284
}
252
285
253
286
/* Prints out a password to stdout */
275
308
}
276
309
free(plugin_node->environ);
277
310
free(plugin_node->buffer);
278
311
279
312
/* Removes the plugin from the singly-linked list */
280
313
if(plugin_node == plugin_list){
281
314
/* First one - simple */
325
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
359
if(ret == -1){
327
360
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
361
exitstatus = EX_OSERR;
329
362
goto fallback;
330
363
}
331
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
365
if(ret == -1){
333
366
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
367
exitstatus = EX_OSERR;
335
368
goto fallback;
336
369
}
337
370
369
402
.doc = "Group ID the plugins will run as", .group = 3 },
370
403
{ .name = "debug", .key = 132,
371
404
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
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 },
372
414
{ .name = NULL }
373
415
};
374
416
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
378
422
case 'g': /* --global-options */
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;
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
388
428
}
389
429
}
390
430
}
391
431
break;
392
432
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
433
add_environment(getplugin(NULL), arg, true);
399
434
break;
400
435
case 'o': /* --options-for */
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;
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
418
454
}
419
455
}
420
456
}
421
457
break;
422
458
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
459
{
427
460
char *envdef = strchr(arg, ':');
428
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
429
464
break;
430
465
}
431
466
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
434
472
}
473
add_environment(getplugin(arg), envdef, true);
435
474
}
436
475
break;
437
476
case 'd': /* --disable */
438
if (arg != NULL){
477
{
439
478
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
479
if(p != NULL){
480
p->disabled = true;
442
481
}
443
p->disabled = true;
444
482
}
445
483
break;
446
484
case 'e': /* --enable */
447
if (arg != NULL){
485
{
448
486
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = false;
451
489
}
452
p->disabled = false;
453
490
}
454
491
break;
455
492
case 128: /* --plugin-dir */
456
493
free(plugindir);
457
494
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
495
break;
462
496
case 129: /* --config-file */
463
497
/* This is already done by parse_opt_config_file() */
464
498
break;
465
499
case 130: /* --userid */
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);
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);
505
break;
471
506
}
507
uid = (uid_t)tmpmax;
472
508
break;
473
509
case 131: /* --groupid */
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);
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);
515
break;
479
516
}
517
gid = (gid_t)tmpmax;
480
518
break;
481
519
case 132: /* --debug */
482
520
debug = true;
483
521
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
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);
534
exit(EXIT_SUCCESS);
535
break;
484
536
/*
485
537
* When adding more options before this line, remember to also add a
486
538
* "case" to the "parse_opt_config_file" function below.
489
541
/* Cryptsetup always passes an argument, which is an empty
490
542
string if "none" was specified in /etc/crypttab. So if
491
543
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
544
if(arg[0] == '\0'){
545
break;
494
546
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
547
default:
499
548
return ARGP_ERR_UNKNOWN;
500
549
}
501
return 0;
550
return errno; /* Set to 0 at start */
502
551
}
503
552
504
553
/* This option parser is the same as parse_opt() above, except it
505
554
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch (key) {
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
510
560
case 'g': /* --global-options */
511
561
case 'G': /* --global-env */
512
562
case 'o': /* --options-for */
518
568
case 129: /* --config-file */
519
569
free(argfile);
520
570
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
571
break;
525
572
case 130: /* --userid */
526
573
case 131: /* --groupid */
527
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
528
578
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
579
break;
531
580
default:
532
581
return ARGP_ERR_UNKNOWN;
533
582
}
534
return 0;
583
return errno;
535
584
}
536
585
537
586
struct argp argp = { .options = options,
541
590
542
591
/* Parse using parse_opt_config_file() in order to get the custom
543
592
config file location, if any. */
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;
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
548
607
goto fallback;
549
608
}
550
609
552
611
argp.parser = parse_opt;
553
612
554
613
/* Open the configfile if available */
555
if (argfile == NULL){
614
if(argfile == NULL){
556
615
conffp = fopen(AFILE, "r");
557
616
} else {
558
617
conffp = fopen(argfile, "r");
559
}
618
}
560
619
if(conffp != NULL){
561
620
char *org_line = NULL;
562
621
char *p, *arg, *new_arg, *line;
563
622
size_t size = 0;
564
623
const char whitespace_delims[] = " \r\t\f\v\n";
565
624
const char comment_delim[] = "#";
566
625
567
626
custom_argc = 1;
568
627
custom_argv = malloc(sizeof(char*) * 2);
569
628
if(custom_argv == NULL){
570
629
perror("malloc");
571
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
572
631
goto fallback;
573
632
}
574
633
custom_argv[0] = argv[0];
575
634
custom_argv[1] = NULL;
576
635
577
636
/* for each line in the config file, strip whitespace and ignore
578
637
commented text */
579
638
while(true){
581
640
if(sret == -1){
582
641
break;
583
642
}
584
643
585
644
line = org_line;
586
645
arg = strsep(&line, comment_delim);
587
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
591
650
new_arg = strdup(p);
592
651
if(new_arg == NULL){
593
652
perror("strdup");
594
exitstatus = EXIT_FAILURE;
653
exitstatus = EX_OSERR;
595
654
free(org_line);
596
655
goto fallback;
597
656
}
601
660
* ((unsigned int) custom_argc + 1));
602
661
if(custom_argv == NULL){
603
662
perror("realloc");
604
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
605
664
free(org_line);
606
665
goto fallback;
607
666
}
608
667
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
610
669
}
611
670
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
612
679
free(org_line);
613
680
} else {
614
681
/* Check for harmful errors and go to fallback. Other errors might
615
682
not affect opening plugins */
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
617
684
perror("fopen");
618
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_IOERR;
619
686
goto fallback;
620
687
}
621
688
}
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
624
691
if(custom_argv != NULL){
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;
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
630
706
goto fallback;
631
707
}
632
708
}
633
709
634
710
/* Parse actual command line arguments, to let them override the
635
711
config file */
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;
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
640
726
goto fallback;
641
727
}
642
728
647
733
for(char **a = p->argv; *a != NULL; a++){
648
734
fprintf(stderr, "\tArg: %s\n", *a);
649
735
}
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
651
737
for(char **a = p->environ; *a != NULL; a++){
652
738
fprintf(stderr, "\t%s\n", *a);
653
739
}
655
741
}
656
742
657
743
/* Strip permissions down to nobody */
744
setgid(gid);
745
if(ret == -1){
746
perror("setgid");
747
}
658
748
ret = setuid(uid);
659
if (ret == -1){
749
if(ret == -1){
660
750
perror("setuid");
661
}
662
setgid(gid);
663
if (ret == -1){
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 */
751
}
752
753
/* Open plugin directory with close_on_exec flag */
680
754
{
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
}
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
689
796
}
690
797
}
691
798
693
800
694
801
/* Read and execute any executable in the plugin directory*/
695
802
while(true){
696
dirst = readdir(dir);
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
697
806
698
807
/* All directory entries have been processed */
699
808
if(dirst == NULL){
700
if (errno == EBADF){
809
if(errno == EBADF){
701
810
perror("readdir");
702
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
703
812
goto fallback;
704
813
}
705
814
break;
750
859
continue;
751
860
}
752
861
}
753
862
754
863
char *filename;
755
864
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
757
867
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
759
871
}
760
872
if(ret < 0){
761
873
perror("asprintf");
762
874
continue;
763
875
}
764
876
765
ret = stat(filename, &st);
766
if (ret == -1){
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
767
879
perror("stat");
768
880
free(filename);
769
881
continue;
770
882
}
771
883
772
884
/* Ignore non-executable files */
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
774
887
if(debug){
775
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
889
" with bad type or mode\n", filename);
822
935
}
823
936
824
937
int pipefd[2];
825
ret = pipe(pipefd);
826
if (ret == -1){
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
827
940
perror("pipe");
828
exitstatus = EXIT_FAILURE;
941
exitstatus = EX_OSERR;
829
942
goto fallback;
830
943
}
831
944
/* Ask OS to automatic close the pipe on exec */
832
945
ret = set_cloexec_flag(pipefd[0]);
833
946
if(ret < 0){
834
947
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
948
exitstatus = EX_OSERR;
836
949
goto fallback;
837
950
}
838
951
ret = set_cloexec_flag(pipefd[1]);
839
952
if(ret < 0){
840
953
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
954
exitstatus = EX_OSERR;
842
955
goto fallback;
843
956
}
844
957
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
846
961
if(ret < 0){
847
962
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
963
exitstatus = EX_OSERR;
849
964
goto fallback;
850
965
}
851
966
/* Starting a new process to be watched */
852
pid_t pid = fork();
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
853
971
if(pid == -1){
854
972
perror("fork");
855
exitstatus = EXIT_FAILURE;
973
exitstatus = EX_OSERR;
856
974
goto fallback;
857
975
}
858
976
if(pid == 0){
860
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
861
979
if(ret < 0){
862
980
perror("sigaction");
863
_exit(EXIT_FAILURE);
981
_exit(EX_OSERR);
864
982
}
865
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
866
984
if(ret < 0){
867
985
perror("sigprocmask");
868
_exit(EXIT_FAILURE);
986
_exit(EX_OSERR);
869
987
}
870
988
871
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
872
990
if(ret == -1){
873
991
perror("dup2");
874
_exit(EXIT_FAILURE);
992
_exit(EX_OSERR);
875
993
}
876
994
877
995
if(dirfd(dir) < 0){
882
1000
if(p->environ[0] == NULL){
883
1001
if(execv(filename, p->argv) < 0){
884
1002
perror("execv");
885
_exit(EXIT_FAILURE);
1003
_exit(EX_OSERR);
886
1004
}
887
1005
} else {
888
1006
if(execve(filename, p->argv, p->environ) < 0){
889
1007
perror("execve");
890
_exit(EXIT_FAILURE);
1008
_exit(EX_OSERR);
891
1009
}
892
1010
}
893
1011
/* no return */
894
1012
}
895
1013
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
897
1016
free(filename);
898
1017
plugin *new_plugin = getplugin(dirst->d_name);
899
if (new_plugin == NULL){
1018
if(new_plugin == NULL){
900
1019
perror("getplugin");
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
902
1023
if(ret < 0){
903
1024
perror("sigprocmask");
904
1025
}
905
exitstatus = EXIT_FAILURE;
1026
exitstatus = EX_OSERR;
906
1027
goto fallback;
907
1028
}
908
1029
911
1032
912
1033
/* Unblock SIGCHLD so signal handler can be run if this process
913
1034
has already completed */
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
915
1038
if(ret < 0){
916
1039
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1040
exitstatus = EX_OSERR;
918
1041
goto fallback;
919
1042
}
920
1043
921
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
922
1046
923
if (maxfd < new_plugin->fd){
1047
if(maxfd < new_plugin->fd){
924
1048
maxfd = new_plugin->fd;
925
1049
}
926
1050
}
927
1051
928
closedir(dir);
1052
TEMP_FAILURE_RETRY(closedir(dir));
929
1053
dir = NULL;
1054
free_plugin(getplugin(NULL));
930
1055
931
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
1057
if(p->pid != 0){
943
1068
while(plugin_list){
944
1069
fd_set rfds = rfds_all;
945
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if (select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
947
1072
perror("select");
948
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
949
1074
goto fallback;
950
1075
}
951
1076
/* OK, now either a process completed, or something can be read
952
1077
from one of them */
953
1078
for(plugin *proc = plugin_list; proc != NULL;){
954
1079
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
956
1081
/* Only accept the plugin output if it exited cleanly */
957
1082
if(not WIFEXITED(proc->status)
958
1083
or WEXITSTATUS(proc->status) != 0){
959
1084
/* Bad exit by plugin */
960
1085
961
1086
if(debug){
962
1087
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
965
1091
WEXITSTATUS(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));
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)));
970
1098
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
973
1101
}
974
1102
}
975
1103
976
1104
/* Remove the plugin */
977
FD_CLR(proc->fd, &rfds_all);
978
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
979
1108
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
981
1113
if(ret < 0){
982
1114
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1115
exitstatus = EX_OSERR;
984
1116
goto fallback;
985
1117
}
986
1118
989
1121
proc = next_plugin;
990
1122
991
1123
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
994
1127
if(ret < 0){
995
1128
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
1129
exitstatus = EX_OSERR;
997
1130
goto fallback;
998
1131
}
999
1132
1010
1143
proc->buffer_length);
1011
1144
if(not bret){
1012
1145
perror("print_out_password");
1013
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
1014
1147
}
1015
1148
goto fallback;
1016
1149
}
1017
1150
1018
1151
/* This process has not completed. Does it have any output? */
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1020
1155
/* This process had nothing to say at this time */
1021
1156
proc = proc->next;
1022
1157
continue;
1025
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
1162
+ (size_t) BUFFER_SIZE);
1028
if (proc->buffer == NULL){
1163
if(proc->buffer == NULL){
1029
1164
perror("malloc");
1030
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
1031
1166
goto fallback;
1032
1167
}
1033
1168
proc->buffer_size += BUFFER_SIZE;
1034
1169
}
1035
1170
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1038
1175
if(sret < 0){
1039
1176
/* Read error from this process; ignore the error */
1040
1177
proc = proc->next;
1048
1185
}
1049
1186
}
1050
1187
}
1051
1052
1188
1189
1053
1190
fallback:
1054
1191
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1056
1194
/* Fallback if all plugins failed, none are found or an error
1057
1195
occured */
1058
1196
bool bret;
1067
1205
bret = print_out_password(passwordbuffer, len);
1068
1206
if(not bret){
1069
1207
perror("print_out_password");
1070
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;
1071
1209
}
1072
1210
}
1073
1211
1075
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1076
1214
if(ret == -1){
1077
1215
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1216
exitstatus = EX_OSERR;
1079
1217
}
1080
1218
1081
1219
if(custom_argv != NULL){
1102
1240
}
1103
1241
1104
1242
/* Wait for any remaining child processes to terminate */
1105
do{
1243
do {
1106
1244
ret = wait(NULL);
1107
1245
} while(ret >= 0);
1108
1246
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0