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- Committer: teddy at bsnet
- Date: 2010-09-08 19:25:13 UTC
- mto: (24.1.162 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100908192513-ccso0jpam3qg4yze
* TODO: Clarifications.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
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
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
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 */
66
73
67
74
#define BUFFER_SIZE 256
68
75
69
76
#define PDIR "/lib/mandos/plugins.d"
70
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
78
72
const char *argp_program_version = "plugin-runner 1.0";
79
const char *argp_program_version = "plugin-runner " VERSION;
73
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
81
75
struct plugin;
76
77
82
typedef struct plugin{
78
83
char *name; /* can be NULL or any plugin name */
79
84
char **argv;
81
86
char **environ;
82
87
int envc;
83
88
bool disabled;
84
89
85
90
/* Variables used for running processes*/
86
91
pid_t pid;
87
92
int fd;
89
94
size_t buffer_size;
90
95
size_t buffer_length;
91
96
bool eof;
92
volatile bool completed;
93
volatile int status;
97
volatile sig_atomic_t completed;
98
int status;
94
99
struct plugin *next;
95
100
} plugin;
96
101
99
104
/* Gets an existing plugin based on name,
100
105
or if none is found, creates a new one */
101
106
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
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))){
106
111
return p;
107
112
}
108
113
}
109
114
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
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){
112
120
return NULL;
113
121
}
114
122
char *copy_name = NULL;
115
123
if(name != NULL){
116
copy_name = strdup(name);
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
117
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
118
131
return NULL;
119
132
}
120
133
}
121
134
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
126
139
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
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;
129
145
free(copy_name);
130
146
free(new_plugin);
147
errno = e;
131
148
return NULL;
132
149
}
133
150
new_plugin->argv[0] = copy_name;
134
151
new_plugin->argv[1] = NULL;
135
152
136
new_plugin->environ = malloc(sizeof(char *));
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
137
156
if(new_plugin->environ == NULL){
157
int e = errno;
138
158
free(copy_name);
139
159
free(new_plugin->argv);
140
160
free(new_plugin);
161
errno = e;
141
162
return NULL;
142
163
}
143
164
new_plugin->environ[0] = NULL;
151
172
static bool add_to_char_array(const char *new, char ***array,
152
173
int *len){
153
174
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
156
179
/* Malloc check */
157
180
if(*array == NULL){
158
181
return false;
159
182
}
160
183
/* Make a copy of the new string */
161
char *copy = strdup(new);
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
162
188
if(copy == NULL){
163
189
return false;
164
190
}
190
216
if(strncmp(*e, def, namelen + 1) == 0){
191
217
/* It already exists */
192
218
if(replace){
193
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);
194
223
if(new == NULL){
195
224
return false;
196
225
}
206
235
/*
207
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
237
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
239
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
242
/* If reading the flags failed, return error indication now. */
215
243
if(ret < 0){
216
244
return ret;
217
245
}
218
246
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
220
249
}
221
250
222
251
223
252
/* Mark processes as completed when they exit, and save their exit
224
253
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
226
256
while(true){
227
257
plugin *proc = plugin_list;
228
258
int status;
232
262
break;
233
263
}
234
264
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
237
268
}
238
/* No child processes */
239
break;
269
perror("waitpid");
240
270
}
241
271
242
272
/* A child exited, find it in process_list */
248
278
continue;
249
279
}
250
280
proc->status = status;
251
proc->completed = true;
281
proc->completed = 1;
252
282
}
283
errno = old_errno;
253
284
}
254
285
255
286
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
287
static bool print_out_password(const char *buffer, size_t length){
257
288
ssize_t ret;
258
289
for(size_t written = 0; written < length; written += (size_t)ret){
259
290
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
277
308
}
278
309
free(plugin_node->environ);
279
310
free(plugin_node->buffer);
280
311
281
312
/* Removes the plugin from the singly-linked list */
282
313
if(plugin_node == plugin_list){
283
314
/* First one - simple */
311
342
struct stat st;
312
343
fd_set rfds_all;
313
344
int ret, maxfd = 0;
345
ssize_t sret;
314
346
uid_t uid = 65534;
315
347
gid_t gid = 65534;
316
348
bool debug = false;
326
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
359
if(ret == -1){
328
360
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
361
exitstatus = EX_OSERR;
330
362
goto fallback;
331
363
}
332
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
365
if(ret == -1){
334
366
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
367
exitstatus = EX_OSERR;
336
368
goto fallback;
337
369
}
338
370
370
402
.doc = "Group ID the plugins will run as", .group = 3 },
371
403
{ .name = "debug", .key = 132,
372
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 },
373
414
{ .name = NULL }
374
415
};
375
416
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
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;
379
422
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
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;
389
428
}
390
429
}
391
430
}
392
431
break;
393
432
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
433
add_environment(getplugin(NULL), arg, true);
406
434
break;
407
435
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
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;
425
454
}
426
455
}
427
456
}
428
457
break;
429
458
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
459
{
434
460
char *envdef = strchr(arg, ':');
435
461
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
442
467
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
445
472
}
473
add_environment(getplugin(arg), envdef, true);
446
474
}
447
475
break;
448
476
case 'd': /* --disable */
449
if (arg != NULL){
477
{
450
478
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
479
if(p != NULL){
480
p->disabled = true;
453
481
}
454
p->disabled = true;
455
482
}
456
483
break;
457
484
case 'e': /* --enable */
458
if (arg != NULL){
485
{
459
486
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = false;
462
489
}
463
p->disabled = false;
464
490
}
465
491
break;
466
492
case 128: /* --plugin-dir */
493
free(plugindir);
467
494
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
495
break;
472
496
case 129: /* --config-file */
473
497
/* This is already done by parse_opt_config_file() */
474
498
break;
475
499
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
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;
506
}
507
uid = (uid_t)tmpmax;
477
508
break;
478
509
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
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;
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;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
484
540
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
546
}
489
547
default:
490
548
return ARGP_ERR_UNKNOWN;
491
549
}
492
return 0;
550
return errno; /* Set to 0 at start */
493
551
}
494
552
495
553
/* This option parser is the same as parse_opt() above, except it
496
554
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
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){
501
560
case 'g': /* --global-options */
502
561
case 'G': /* --global-env */
503
562
case 'o': /* --options-for */
507
566
case 128: /* --plugin-dir */
508
567
break;
509
568
case 129: /* --config-file */
569
free(argfile);
510
570
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
513
}
514
break;
571
break;
515
572
case 130: /* --userid */
516
573
case 131: /* --groupid */
517
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
518
578
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
520
579
break;
521
580
default:
522
581
return ARGP_ERR_UNKNOWN;
523
582
}
524
return 0;
583
return errno;
525
584
}
526
585
527
586
struct argp argp = { .options = options,
529
588
.args_doc = "",
530
589
.doc = "Mandos plugin runner -- Run plugins" };
531
590
532
/* Parse using the parse_opt_config_file in order to get the custom
591
/* Parse using parse_opt_config_file() in order to get the custom
533
592
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
536
fprintf(stderr, "Unknown error while parsing arguments\n");
537
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;
538
607
goto fallback;
539
608
}
540
609
542
611
argp.parser = parse_opt;
543
612
544
613
/* Open the configfile if available */
545
if (argfile == NULL){
614
if(argfile == NULL){
546
615
conffp = fopen(AFILE, "r");
547
616
} else {
548
617
conffp = fopen(argfile, "r");
549
}
618
}
550
619
if(conffp != NULL){
551
620
char *org_line = NULL;
552
621
char *p, *arg, *new_arg, *line;
553
622
size_t size = 0;
554
ssize_t sret;
555
623
const char whitespace_delims[] = " \r\t\f\v\n";
556
624
const char comment_delim[] = "#";
557
625
558
626
custom_argc = 1;
559
627
custom_argv = malloc(sizeof(char*) * 2);
560
628
if(custom_argv == NULL){
561
629
perror("malloc");
562
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
563
631
goto fallback;
564
632
}
565
633
custom_argv[0] = argv[0];
566
634
custom_argv[1] = NULL;
567
635
568
636
/* for each line in the config file, strip whitespace and ignore
569
637
commented text */
570
638
while(true){
572
640
if(sret == -1){
573
641
break;
574
642
}
575
643
576
644
line = org_line;
577
645
arg = strsep(&line, comment_delim);
578
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
582
650
new_arg = strdup(p);
583
651
if(new_arg == NULL){
584
652
perror("strdup");
585
exitstatus = EXIT_FAILURE;
653
exitstatus = EX_OSERR;
586
654
free(org_line);
587
655
goto fallback;
588
656
}
592
660
* ((unsigned int) custom_argc + 1));
593
661
if(custom_argv == NULL){
594
662
perror("realloc");
595
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
596
664
free(org_line);
597
665
goto fallback;
598
666
}
599
667
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
601
669
}
602
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
}
603
679
free(org_line);
604
680
} else {
605
681
/* Check for harmful errors and go to fallback. Other errors might
606
682
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
684
perror("fopen");
609
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_OSERR;
610
686
goto fallback;
611
687
}
612
688
}
613
/* If there was any arguments from configuration file,
614
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 */
615
691
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
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;
621
706
goto fallback;
622
707
}
623
708
}
624
709
625
710
/* Parse actual command line arguments, to let them override the
626
711
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
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;
631
726
goto fallback;
632
727
}
633
728
638
733
for(char **a = p->argv; *a != NULL; a++){
639
734
fprintf(stderr, "\tArg: %s\n", *a);
640
735
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
737
for(char **a = p->environ; *a != NULL; a++){
643
738
fprintf(stderr, "\t%s\n", *a);
644
739
}
646
741
}
647
742
648
743
/* Strip permissions down to nobody */
744
setgid(gid);
745
if(ret == -1){
746
perror("setgid");
747
}
649
748
ret = setuid(uid);
650
if (ret == -1){
749
if(ret == -1){
651
750
perror("setuid");
652
}
653
setgid(gid);
654
if (ret == -1){
655
perror("setgid");
656
}
657
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
664
if(dir == NULL){
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
667
goto fallback;
668
}
669
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
751
}
752
753
/* Open plugin directory with close_on_exec flag */
671
754
{
672
int dir_fd = dirfd(dir);
673
if(dir_fd >= 0){
674
ret = set_cloexec_flag(dir_fd);
675
if(ret < 0){
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
679
}
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;
680
796
}
681
797
}
682
798
684
800
685
801
/* Read and execute any executable in the plugin directory*/
686
802
while(true){
687
dirst = readdir(dir);
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
688
806
689
807
/* All directory entries have been processed */
690
808
if(dirst == NULL){
691
if (errno == EBADF){
809
if(errno == EBADF){
692
810
perror("readdir");
693
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
694
812
goto fallback;
695
813
}
696
814
break;
706
824
707
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
708
826
".dpkg-old",
827
".dpkg-bak",
709
828
".dpkg-divert", NULL };
710
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
830
size_t pre_len = strlen(*pre);
725
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
845
size_t suf_len = strlen(*suf);
727
846
if((d_name_len >= suf_len)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
729
848
== 0)){
730
849
if(debug){
731
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
740
859
continue;
741
860
}
742
861
}
743
862
744
863
char *filename;
745
864
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
747
867
} else {
748
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));
749
871
}
750
872
if(ret < 0){
751
873
perror("asprintf");
752
874
continue;
753
875
}
754
876
755
ret = stat(filename, &st);
756
if (ret == -1){
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
757
879
perror("stat");
758
880
free(filename);
759
881
continue;
760
882
}
761
883
762
884
/* Ignore non-executable files */
763
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)){
764
887
if(debug){
765
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
889
" with bad type or mode\n", filename);
812
935
}
813
936
814
937
int pipefd[2];
815
ret = pipe(pipefd);
816
if (ret == -1){
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
817
940
perror("pipe");
818
exitstatus = EXIT_FAILURE;
941
exitstatus = EX_OSERR;
819
942
goto fallback;
820
943
}
821
944
/* Ask OS to automatic close the pipe on exec */
822
945
ret = set_cloexec_flag(pipefd[0]);
823
946
if(ret < 0){
824
947
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
948
exitstatus = EX_OSERR;
826
949
goto fallback;
827
950
}
828
951
ret = set_cloexec_flag(pipefd[1]);
829
952
if(ret < 0){
830
953
perror("set_cloexec_flag");
831
exitstatus = EXIT_FAILURE;
954
exitstatus = EX_OSERR;
832
955
goto fallback;
833
956
}
834
957
/* Block SIGCHLD until process is safely in process list */
835
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));
836
961
if(ret < 0){
837
962
perror("sigprocmask");
838
exitstatus = EXIT_FAILURE;
963
exitstatus = EX_OSERR;
839
964
goto fallback;
840
965
}
841
966
/* Starting a new process to be watched */
842
pid_t pid = fork();
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
843
971
if(pid == -1){
844
972
perror("fork");
845
exitstatus = EXIT_FAILURE;
973
exitstatus = EX_OSERR;
846
974
goto fallback;
847
975
}
848
976
if(pid == 0){
850
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
851
979
if(ret < 0){
852
980
perror("sigaction");
853
_exit(EXIT_FAILURE);
981
_exit(EX_OSERR);
854
982
}
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
984
if(ret < 0){
857
985
perror("sigprocmask");
858
_exit(EXIT_FAILURE);
986
_exit(EX_OSERR);
859
987
}
860
988
861
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
862
990
if(ret == -1){
863
991
perror("dup2");
864
_exit(EXIT_FAILURE);
992
_exit(EX_OSERR);
865
993
}
866
994
867
995
if(dirfd(dir) < 0){
872
1000
if(p->environ[0] == NULL){
873
1001
if(execv(filename, p->argv) < 0){
874
1002
perror("execv");
875
_exit(EXIT_FAILURE);
1003
_exit(EX_OSERR);
876
1004
}
877
1005
} else {
878
1006
if(execve(filename, p->argv, p->environ) < 0){
879
1007
perror("execve");
880
_exit(EXIT_FAILURE);
1008
_exit(EX_OSERR);
881
1009
}
882
1010
}
883
1011
/* no return */
884
1012
}
885
1013
/* Parent process */
886
close(pipefd[1]); /* Close unused write end of pipe */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
887
1016
free(filename);
888
1017
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
1018
if(new_plugin == NULL){
890
1019
perror("getplugin");
891
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)));
892
1023
if(ret < 0){
893
1024
perror("sigprocmask");
894
1025
}
895
exitstatus = EXIT_FAILURE;
1026
exitstatus = EX_OSERR;
896
1027
goto fallback;
897
1028
}
898
1029
901
1032
902
1033
/* Unblock SIGCHLD so signal handler can be run if this process
903
1034
has already completed */
904
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));
905
1038
if(ret < 0){
906
1039
perror("sigprocmask");
907
exitstatus = EXIT_FAILURE;
1040
exitstatus = EX_OSERR;
908
1041
goto fallback;
909
1042
}
910
1043
911
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
912
1046
913
if (maxfd < new_plugin->fd){
1047
if(maxfd < new_plugin->fd){
914
1048
maxfd = new_plugin->fd;
915
1049
}
916
917
1050
}
918
1051
919
closedir(dir);
1052
TEMP_FAILURE_RETRY(closedir(dir));
920
1053
dir = NULL;
921
1054
free_plugin(getplugin(NULL));
1055
922
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
1057
if(p->pid != 0){
924
1058
break;
929
1063
free_plugin_list();
930
1064
}
931
1065
}
932
1066
933
1067
/* Main loop while running plugins exist */
934
1068
while(plugin_list){
935
1069
fd_set rfds = rfds_all;
936
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
if (select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
938
1072
perror("select");
939
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
940
1074
goto fallback;
941
1075
}
942
1076
/* OK, now either a process completed, or something can be read
943
1077
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1078
for(plugin *proc = plugin_list; proc != NULL;){
945
1079
/* Is this process completely done? */
946
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
947
1081
/* Only accept the plugin output if it exited cleanly */
948
1082
if(not WIFEXITED(proc->status)
949
1083
or WEXITSTATUS(proc->status) != 0){
950
1084
/* Bad exit by plugin */
951
1085
952
1086
if(debug){
953
1087
if(WIFEXITED(proc->status)){
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
956
1091
WEXITSTATUS(proc->status));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
960
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)));
961
1098
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
964
1101
}
965
1102
}
966
1103
967
1104
/* Remove the plugin */
968
FD_CLR(proc->fd, &rfds_all);
969
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
970
1108
/* Block signal while modifying process_list */
971
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));
972
1113
if(ret < 0){
973
1114
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
1115
exitstatus = EX_OSERR;
975
1116
goto fallback;
976
1117
}
1118
1119
plugin *next_plugin = proc->next;
977
1120
free_plugin(proc);
1121
proc = next_plugin;
1122
978
1123
/* We are done modifying process list, so unblock signal */
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
981
1127
if(ret < 0){
982
1128
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1129
exitstatus = EX_OSERR;
984
1130
goto fallback;
985
1131
}
986
1132
987
1133
if(plugin_list == NULL){
988
1134
break;
989
1135
}
1136
990
1137
continue;
991
1138
}
992
1139
993
1140
/* This process exited nicely, so print its buffer */
994
1141
995
1142
bool bret = print_out_password(proc->buffer,
996
1143
proc->buffer_length);
997
1144
if(not bret){
998
1145
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
1000
1147
}
1001
1148
goto fallback;
1002
1149
}
1003
1150
1004
1151
/* This process has not completed. Does it have any output? */
1005
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 */
1006
1155
/* This process had nothing to say at this time */
1156
proc = proc->next;
1007
1157
continue;
1008
1158
}
1009
1159
/* Before reading, make the process' data buffer large enough */
1010
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
1162
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1163
if(proc->buffer == NULL){
1014
1164
perror("malloc");
1015
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
1016
1166
goto fallback;
1017
1167
}
1018
1168
proc->buffer_size += BUFFER_SIZE;
1019
1169
}
1020
1170
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
1024
1176
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1025
1178
continue;
1026
1179
}
1027
if(ret == 0){
1180
if(sret == 0){
1028
1181
/* got EOF */
1029
1182
proc->eof = true;
1030
1183
} else {
1031
proc->buffer_length += (size_t) ret;
1184
proc->buffer_length += (size_t) sret;
1032
1185
}
1033
1186
}
1034
1187
}
1035
1036
1188
1189
1037
1190
fallback:
1038
1191
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1040
1194
/* Fallback if all plugins failed, none are found or an error
1041
1195
occured */
1042
1196
bool bret;
1051
1205
bret = print_out_password(passwordbuffer, len);
1052
1206
if(not bret){
1053
1207
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;
1055
1209
}
1056
1210
}
1057
1211
1059
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1214
if(ret == -1){
1061
1215
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1216
exitstatus = EX_OSERR;
1063
1217
}
1064
1218
1065
1219
if(custom_argv != NULL){
1066
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1221
free(*arg);
1073
1227
closedir(dir);
1074
1228
}
1075
1229
1076
/* Free the process list and kill the processes */
1230
/* Kill the processes */
1077
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1232
if(p->pid != 0){
1079
1233
close(p->fd);
1086
1240
}
1087
1241
1088
1242
/* Wait for any remaining child processes to terminate */
1089
do{
1243
do {
1090
1244
ret = wait(NULL);
1091
1245
} while(ret >= 0);
1092
1246
if(errno != ECHILD){
1093
1247
perror("wait");
1094
1248
}
1095
1249
1096
1250
free_plugin_list();
1097
1251
1098
1252
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0