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- Committer: Teddy Hogeborn
- Date: 2008-09-21 12:20:55 UTC
- Revision ID: teddy@fukt.bsnet.se-20080921122055-vrs4tmw1az0yr92u
* mandos.xml (SECURITY): Minor wording improvement.
- files added:
- debian/mandos-client.config
- files removed:
- NEWS
- files modified:
- .bzrignore
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
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
72
66
73
67
#define BUFFER_SIZE 256
74
68
75
69
#define PDIR "/lib/mandos/plugins.d"
76
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
71
78
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
79
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
74
81
75
typedef struct plugin{
85
79
char **environ;
86
80
int envc;
87
81
bool disabled;
88
82
89
83
/* Variables used for running processes*/
90
84
pid_t pid;
91
85
int fd;
93
87
size_t buffer_size;
94
88
size_t buffer_length;
95
89
bool eof;
96
volatile sig_atomic_t completed;
97
int status;
90
volatile bool completed;
91
volatile int status;
98
92
struct plugin *next;
99
93
} plugin;
100
94
103
97
/* Gets an existing plugin based on name,
104
98
or if none is found, creates a new one */
105
99
static plugin *getplugin(char *name){
106
/* Check for existing plugin with that name */
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
if((p->name == name)
109
or (p->name and name and (strcmp(p->name, name) == 0))){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
110
104
return p;
111
105
}
112
106
}
113
107
/* Create a new plugin */
114
plugin *new_plugin = NULL;
115
do {
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
118
if(new_plugin == NULL){
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
119
110
return NULL;
120
111
}
121
112
char *copy_name = NULL;
122
113
if(name != NULL){
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
114
copy_name = strdup(name);
126
115
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
130
116
return NULL;
131
117
}
132
118
}
133
119
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
138
124
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
142
if(new_plugin->argv == NULL){
143
int e = errno;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
144
127
free(copy_name);
145
128
free(new_plugin);
146
errno = e;
147
129
return NULL;
148
130
}
149
131
new_plugin->argv[0] = copy_name;
150
132
new_plugin->argv[1] = NULL;
151
133
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
134
new_plugin->environ = malloc(sizeof(char *));
155
135
if(new_plugin->environ == NULL){
156
int e = errno;
157
136
free(copy_name);
158
137
free(new_plugin->argv);
159
138
free(new_plugin);
160
errno = e;
161
139
return NULL;
162
140
}
163
141
new_plugin->environ[0] = NULL;
171
149
static bool add_to_char_array(const char *new, char ***array,
172
150
int *len){
173
151
/* Resize the pointed-to array to hold one more pointer */
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
178
154
/* Malloc check */
179
155
if(*array == NULL){
180
156
return false;
181
157
}
182
158
/* Make a copy of the new string */
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
159
char *copy = strdup(new);
187
160
if(copy == NULL){
188
161
return false;
189
162
}
215
188
if(strncmp(*e, def, namelen + 1) == 0){
216
189
/* It already exists */
217
190
if(replace){
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
191
char *new = realloc(*e, strlen(def) + 1);
222
192
if(new == NULL){
223
193
return false;
224
194
}
234
204
/*
235
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
206
* Descriptor Flags".
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
208
*/
239
209
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
210
int ret = fcntl(fd, F_GETFD, 0);
241
211
/* If reading the flags failed, return error indication now. */
242
212
if(ret < 0){
243
213
return ret;
244
214
}
245
215
/* Store modified flag word in the descriptor. */
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
248
217
}
249
218
250
219
251
220
/* Mark processes as completed when they exit, and save their exit
252
221
status. */
253
222
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
255
223
while(true){
256
224
plugin *proc = plugin_list;
257
225
int status;
261
229
break;
262
230
}
263
231
if(pid == -1){
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
232
if (errno != ECHILD){
233
perror("waitpid");
267
234
}
268
perror("waitpid");
235
/* No child processes */
236
break;
269
237
}
270
238
271
239
/* A child exited, find it in process_list */
277
245
continue;
278
246
}
279
247
proc->status = status;
280
proc->completed = 1;
248
proc->completed = true;
281
249
}
282
errno = old_errno;
283
250
}
284
251
285
252
/* Prints out a password to stdout */
307
274
}
308
275
free(plugin_node->environ);
309
276
free(plugin_node->buffer);
310
277
311
278
/* Removes the plugin from the singly-linked list */
312
279
if(plugin_node == plugin_list){
313
280
/* First one - simple */
341
308
struct stat st;
342
309
fd_set rfds_all;
343
310
int ret, maxfd = 0;
344
ssize_t sret;
345
311
uid_t uid = 65534;
346
312
gid_t gid = 65534;
347
313
bool debug = false;
401
367
.doc = "Group ID the plugins will run as", .group = 3 },
402
368
{ .name = "debug", .key = 132,
403
369
.doc = "Debug mode", .group = 4 },
404
/*
405
* These reproduce what we would get without ARGP_NO_HELP
406
*/
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.doc = "Print program version", .group = -1 },
413
370
{ .name = NULL }
414
371
};
415
372
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
errno = 0;
418
switch(key){
419
char *tmp;
420
intmax_t tmpmax;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
421
376
case 'g': /* --global-options */
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
427
386
}
428
387
}
429
388
}
430
389
break;
431
390
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
396
}
433
397
break;
434
398
case 'o': /* --options-for */
435
{
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
439
errno = EINVAL;
440
break;
441
}
442
*option_list = '\0';
443
option_list++;
444
if(arg[0] == '\0'){
445
argp_error(state, "Empty plugin name");
446
errno = EINVAL;
447
break;
448
}
449
char *option;
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
452
break;
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
453
416
}
454
417
}
455
418
}
456
419
break;
457
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
458
424
{
459
425
char *envdef = strchr(arg, ':');
460
426
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
427
break;
464
428
}
465
429
*envdef = '\0';
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
471
432
}
472
add_environment(getplugin(arg), envdef, true);
473
433
}
474
434
break;
475
435
case 'd': /* --disable */
476
{
436
if (arg != NULL){
477
437
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
480
440
}
441
p->disabled = true;
481
442
}
482
443
break;
483
444
case 'e': /* --enable */
484
{
445
if (arg != NULL){
485
446
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
488
449
}
450
p->disabled = false;
489
451
}
490
452
break;
491
453
case 128: /* --plugin-dir */
492
454
free(plugindir);
493
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
494
459
break;
495
460
case 129: /* --config-file */
496
461
/* This is already done by parse_opt_config_file() */
497
462
break;
498
463
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
504
break;
505
}
506
uid = (uid_t)tmpmax;
464
uid = (uid_t)strtol(arg, NULL, 10);
507
465
break;
508
466
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
514
break;
515
}
516
gid = (gid_t)tmpmax;
467
gid = (gid_t)strtol(arg, NULL, 10);
517
468
break;
518
469
case 132: /* --debug */
519
470
debug = true;
520
471
break;
521
/*
522
* These reproduce what we would get without ARGP_NO_HELP
523
*/
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
533
exit(EXIT_SUCCESS);
534
break;
535
/*
536
* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
538
*/
539
472
case ARGP_KEY_ARG:
540
473
/* Cryptsetup always passes an argument, which is an empty
541
474
string if "none" was specified in /etc/crypttab. So if
542
475
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
545
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
546
482
default:
547
483
return ARGP_ERR_UNKNOWN;
548
484
}
549
return errno; /* Set to 0 at start */
485
return 0;
550
486
}
551
487
552
488
/* This option parser is the same as parse_opt() above, except it
553
489
ignores everything but the --config-file option. */
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
559
494
case 'g': /* --global-options */
560
495
case 'G': /* --global-env */
561
496
case 'o': /* --options-for */
567
502
case 129: /* --config-file */
568
503
free(argfile);
569
504
argfile = strdup(arg);
570
break;
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
571
509
case 130: /* --userid */
572
510
case 131: /* --groupid */
573
511
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
578
514
break;
579
515
default:
580
516
return ARGP_ERR_UNKNOWN;
581
517
}
582
return errno;
518
return 0;
583
519
}
584
520
585
521
struct argp argp = { .options = options,
587
523
.args_doc = "",
588
524
.doc = "Mandos plugin runner -- Run plugins" };
589
525
590
/* Parse using parse_opt_config_file() in order to get the custom
526
/* Parse using the parse_opt_config_file in order to get the custom
591
527
config file location, if any. */
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
594
NULL, NULL);
595
switch(ret){
596
case 0:
597
break;
598
case ENOMEM:
599
default:
600
errno = ret;
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
603
goto fallback;
604
case EINVAL:
605
exitstatus = EX_USAGE;
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
606
532
goto fallback;
607
533
}
608
534
610
536
argp.parser = parse_opt;
611
537
612
538
/* Open the configfile if available */
613
if(argfile == NULL){
539
if (argfile == NULL){
614
540
conffp = fopen(AFILE, "r");
615
541
} else {
616
542
conffp = fopen(argfile, "r");
617
}
543
}
618
544
if(conffp != NULL){
619
545
char *org_line = NULL;
620
546
char *p, *arg, *new_arg, *line;
621
547
size_t size = 0;
548
ssize_t sret;
622
549
const char whitespace_delims[] = " \r\t\f\v\n";
623
550
const char comment_delim[] = "#";
624
551
625
552
custom_argc = 1;
626
553
custom_argv = malloc(sizeof(char*) * 2);
627
554
if(custom_argv == NULL){
631
558
}
632
559
custom_argv[0] = argv[0];
633
560
custom_argv[1] = NULL;
634
561
635
562
/* for each line in the config file, strip whitespace and ignore
636
563
commented text */
637
564
while(true){
639
566
if(sret == -1){
640
567
break;
641
568
}
642
569
643
570
line = org_line;
644
571
arg = strsep(&line, comment_delim);
645
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
664
591
goto fallback;
665
592
}
666
593
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
594
custom_argv[custom_argc] = NULL;
668
595
}
669
596
}
670
do {
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
673
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
597
free(org_line);
679
598
} else {
680
599
/* Check for harmful errors and go to fallback. Other errors might
681
600
not affect opening plugins */
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
602
perror("fopen");
684
603
exitstatus = EXIT_FAILURE;
685
604
goto fallback;
686
605
}
687
606
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
690
609
if(custom_argv != NULL){
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
693
NULL, NULL);
694
switch(ret){
695
case 0:
696
break;
697
case ENOMEM:
698
default:
699
errno = ret;
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
702
goto fallback;
703
case EINVAL:
704
exitstatus = EX_CONFIG;
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
705
615
goto fallback;
706
616
}
707
617
}
708
618
709
619
/* Parse actual command line arguments, to let them override the
710
620
config file */
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
713
NULL, NULL);
714
switch(ret){
715
case 0:
716
break;
717
case ENOMEM:
718
default:
719
errno = ret;
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
722
goto fallback;
723
case EINVAL:
724
exitstatus = EX_USAGE;
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
725
625
goto fallback;
726
626
}
727
627
732
632
for(char **a = p->argv; *a != NULL; a++){
733
633
fprintf(stderr, "\tArg: %s\n", *a);
734
634
}
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
636
for(char **a = p->environ; *a != NULL; a++){
737
637
fprintf(stderr, "\t%s\n", *a);
738
638
}
740
640
}
741
641
742
642
/* Strip permissions down to nobody */
643
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
743
647
setgid(gid);
744
if(ret == -1){
648
if (ret == -1){
745
649
perror("setgid");
746
650
}
747
ret = setuid(uid);
748
if(ret == -1){
749
perror("setuid");
750
}
751
752
/* Open plugin directory with close_on_exec flag */
651
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
658
if(dir == NULL){
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
661
goto fallback;
662
}
663
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
665
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
772
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
775
goto fallback;
776
}
777
778
#ifndef O_CLOEXEC
779
/* Set the FD_CLOEXEC flag on the directory */
780
ret = set_cloexec_flag(dir_fd);
781
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
785
goto fallback;
786
}
787
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
666
int dir_fd = dirfd(dir);
667
if(dir_fd >= 0){
668
ret = set_cloexec_flag(dir_fd);
669
if(ret < 0){
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
795
674
}
796
675
}
797
676
799
678
800
679
/* Read and execute any executable in the plugin directory*/
801
680
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
681
dirst = readdir(dir);
805
682
806
683
/* All directory entries have been processed */
807
684
if(dirst == NULL){
808
if(errno == EBADF){
685
if (errno == EBADF){
809
686
perror("readdir");
810
687
exitstatus = EXIT_FAILURE;
811
688
goto fallback;
823
700
824
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
702
".dpkg-old",
826
".dpkg-bak",
827
703
".dpkg-divert", NULL };
828
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
705
size_t pre_len = strlen(*pre);
858
734
continue;
859
735
}
860
736
}
861
737
862
738
char *filename;
863
739
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
866
741
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
743
}
871
744
if(ret < 0){
872
745
perror("asprintf");
873
746
continue;
874
747
}
875
748
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
749
ret = stat(filename, &st);
750
if (ret == -1){
878
751
perror("stat");
879
752
free(filename);
880
753
continue;
881
754
}
882
755
883
756
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
758
if(debug){
887
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
760
" with bad type or mode\n", filename);
934
806
}
935
807
936
808
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
809
ret = pipe(pipefd);
810
if (ret == -1){
939
811
perror("pipe");
940
812
exitstatus = EXIT_FAILURE;
941
813
goto fallback;
954
826
goto fallback;
955
827
}
956
828
/* Block SIGCHLD until process is safely in process list */
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
830
if(ret < 0){
961
831
perror("sigprocmask");
962
832
exitstatus = EXIT_FAILURE;
963
833
goto fallback;
964
834
}
965
835
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
836
pid_t pid = fork();
970
837
if(pid == -1){
971
838
perror("fork");
972
839
exitstatus = EXIT_FAILURE;
979
846
perror("sigaction");
980
847
_exit(EXIT_FAILURE);
981
848
}
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
850
if(ret < 0){
984
851
perror("sigprocmask");
985
852
_exit(EXIT_FAILURE);
986
853
}
987
854
988
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
856
if(ret == -1){
990
857
perror("dup2");
1010
877
/* no return */
1011
878
}
1012
879
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
880
close(pipefd[1]); /* Close unused write end of pipe */
1015
881
free(filename);
1016
882
plugin *new_plugin = getplugin(dirst->d_name);
1017
if(new_plugin == NULL){
883
if (new_plugin == NULL){
1018
884
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
886
if(ret < 0){
1023
887
perror("sigprocmask");
1024
888
}
1031
895
1032
896
/* Unblock SIGCHLD so signal handler can be run if this process
1033
897
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
899
if(ret < 0){
1038
900
perror("sigprocmask");
1039
901
exitstatus = EXIT_FAILURE;
1040
902
goto fallback;
1041
903
}
1042
904
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
905
FD_SET(new_plugin->fd, &rfds_all);
1045
906
1046
if(maxfd < new_plugin->fd){
907
if (maxfd < new_plugin->fd){
1047
908
maxfd = new_plugin->fd;
1048
909
}
910
1049
911
}
1050
912
1051
TEMP_FAILURE_RETRY(closedir(dir));
913
closedir(dir);
1052
914
dir = NULL;
1053
free_plugin(getplugin(NULL));
1054
915
1055
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
1056
917
if(p->pid != 0){
1057
918
break;
1062
923
free_plugin_list();
1063
924
}
1064
925
}
1065
926
1066
927
/* Main loop while running plugins exist */
1067
928
while(plugin_list){
1068
929
fd_set rfds = rfds_all;
1069
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
931
if (select_ret == -1){
1071
932
perror("select");
1072
933
exitstatus = EXIT_FAILURE;
1073
934
goto fallback;
1076
937
from one of them */
1077
938
for(plugin *proc = plugin_list; proc != NULL;){
1078
939
/* Is this process completely done? */
1079
if(proc->completed and proc->eof){
940
if(proc->eof and proc->completed){
1080
941
/* Only accept the plugin output if it exited cleanly */
1081
942
if(not WIFEXITED(proc->status)
1082
943
or WEXITSTATUS(proc->status) != 0){
1083
944
/* Bad exit by plugin */
1084
945
1085
946
if(debug){
1086
947
if(WIFEXITED(proc->status)){
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1090
950
WEXITSTATUS(proc->status));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
1097
955
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1100
958
}
1101
959
}
1102
960
1103
961
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
962
FD_CLR(proc->fd, &rfds_all);
963
1107
964
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
1112
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1115
goto fallback;
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
if(ret < 0){
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
NULL);
975
if(ret < 0){
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
1116
983
}
1117
984
1118
985
plugin *next_plugin = proc->next;
1119
986
free_plugin(proc);
1120
987
proc = next_plugin;
1121
1122
/* We are done modifying process list, so unblock signal */
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
1126
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1129
goto fallback;
1130
}
1131
1132
if(plugin_list == NULL){
1133
break;
1134
}
1135
1136
988
continue;
1137
989
}
1138
990
1139
991
/* This process exited nicely, so print its buffer */
1140
992
1141
993
bool bret = print_out_password(proc->buffer,
1142
994
proc->buffer_length);
1143
995
if(not bret){
1148
1000
}
1149
1001
1150
1002
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1004
/* This process had nothing to say at this time */
1155
1005
proc = proc->next;
1156
1006
continue;
1159
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
1011
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1012
if (proc->buffer == NULL){
1163
1013
perror("malloc");
1164
1014
exitstatus = EXIT_FAILURE;
1165
1015
goto fallback;
1167
1017
proc->buffer_size += BUFFER_SIZE;
1168
1018
}
1169
1019
/* Read from the process */
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1175
1023
/* Read error from this process; ignore the error */
1176
1024
proc = proc->next;
1177
1025
continue;
1178
1026
}
1179
if(sret == 0){
1027
if(ret == 0){
1180
1028
/* got EOF */
1181
1029
proc->eof = true;
1182
1030
} else {
1183
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1184
1032
}
1185
1033
}
1186
1034
}
1187
1188
1035
1036
1189
1037
fallback:
1190
1038
1191
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1213
1061
perror("sigaction");
1214
1062
exitstatus = EXIT_FAILURE;
1215
1063
}
1216
1064
1217
1065
if(custom_argv != NULL){
1218
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1219
1067
free(*arg);
1225
1073
closedir(dir);
1226
1074
}
1227
1075
1228
/* Kill the processes */
1076
/* Free the process list and kill the processes */
1229
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1230
1078
if(p->pid != 0){
1231
1079
close(p->fd);
1238
1086
}
1239
1087
1240
1088
/* Wait for any remaining child processes to terminate */
1241
do {
1089
do{
1242
1090
ret = wait(NULL);
1243
1091
} while(ret >= 0);
1244
1092
if(errno != ECHILD){
1245
1093
perror("wait");
1246
1094
}
1247
1095
1248
1096
free_plugin_list();
1249
1097
1250
1098
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0