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- Committer: Teddy Hogeborn
- Date: 2008-09-08 18:54:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20080908185447-dm2ertwxa20qbckf
* INSTALL: Even better text.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- 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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* 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(), strcmp(), strncmp() */
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, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
82
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
74
75
struct plugin;
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
86
79
char **argv;
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
96
89
size_t buffer_size;
97
90
size_t buffer_length;
98
91
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
92
volatile bool completed;
93
volatile int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
106
99
/* Gets an existing plugin based on name,
107
100
or if none is found, creates a new one */
108
101
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
113
106
return p;
114
107
}
115
108
}
116
109
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
122
112
return NULL;
123
113
}
124
114
char *copy_name = NULL;
125
115
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
129
117
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
118
return NULL;
134
119
}
135
120
}
136
121
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
141
126
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
147
129
free(copy_name);
148
130
free(new_plugin);
149
errno = e;
150
131
return NULL;
151
132
}
152
133
new_plugin->argv[0] = copy_name;
153
134
new_plugin->argv[1] = NULL;
154
135
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
158
137
if(new_plugin->environ == NULL){
159
int e = errno;
160
138
free(copy_name);
161
139
free(new_plugin->argv);
162
140
free(new_plugin);
163
errno = e;
164
141
return NULL;
165
142
}
166
143
new_plugin->environ[0] = NULL;
174
151
static bool add_to_char_array(const char *new, char ***array,
175
152
int *len){
176
153
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
181
156
/* Malloc check */
182
157
if(*array == NULL){
183
158
return false;
184
159
}
185
160
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
190
162
if(copy == NULL){
191
163
return false;
192
164
}
218
190
if(strncmp(*e, def, namelen + 1) == 0){
219
191
/* It already exists */
220
192
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def) + 1);
225
194
if(new == NULL){
226
195
return false;
227
196
}
237
206
/*
238
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
208
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
210
*/
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
244
214
/* If reading the flags failed, return error indication now. */
245
215
if(ret < 0){
246
216
return ret;
247
217
}
248
218
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
220
}
252
221
253
222
254
223
/* Mark processes as completed when they exit, and save their exit
255
224
status. */
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
258
226
while(true){
259
227
plugin *proc = plugin_list;
260
228
int status;
264
232
break;
265
233
}
266
234
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
235
if (errno != ECHILD){
236
perror("waitpid");
270
237
}
271
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
272
240
}
273
241
274
242
/* A child exited, find it in process_list */
280
248
continue;
281
249
}
282
250
proc->status = status;
283
proc->completed = 1;
251
proc->completed = true;
284
252
}
285
errno = old_errno;
286
253
}
287
254
288
255
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
290
257
ssize_t ret;
291
258
for(size_t written = 0; written < length; written += (size_t)ret){
292
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
310
277
}
311
278
free(plugin_node->environ);
312
279
free(plugin_node->buffer);
313
280
314
281
/* Removes the plugin from the singly-linked list */
315
282
if(plugin_node == plugin_list){
316
283
/* First one - simple */
344
311
struct stat st;
345
312
fd_set rfds_all;
346
313
int ret, maxfd = 0;
347
ssize_t sret;
348
314
uid_t uid = 65534;
349
315
gid_t gid = 65534;
350
316
bool debug = false;
359
325
sigemptyset(&sigchld_action.sa_mask);
360
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
327
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
364
330
goto fallback;
365
331
}
366
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
333
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
370
336
goto fallback;
371
337
}
372
338
404
370
.doc = "Group ID the plugins will run as", .group = 3 },
405
371
{ .name = "debug", .key = 132,
406
372
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
373
{ .name = NULL }
417
374
};
418
375
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
424
379
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
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;
430
389
}
431
390
}
432
391
}
433
392
break;
434
393
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
436
400
break;
437
401
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
456
419
}
457
420
}
458
421
}
459
422
break;
460
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
461
427
{
462
428
char *envdef = strchr(arg, ':');
463
429
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
430
break;
467
431
}
468
432
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
474
435
}
475
add_environment(getplugin(arg), envdef, true);
476
436
}
477
437
break;
478
438
case 'd': /* --disable */
479
{
439
if (arg != NULL){
480
440
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
483
443
}
444
p->disabled = true;
484
445
}
485
446
break;
486
447
case 'e': /* --enable */
487
{
448
if (arg != NULL){
488
449
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
491
452
}
453
p->disabled = false;
492
454
}
493
455
break;
494
456
case 128: /* --plugin-dir */
495
457
free(plugindir);
496
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
497
462
break;
498
463
case 129: /* --config-file */
499
464
/* This is already done by parse_opt_config_file() */
500
465
break;
501
466
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
467
uid = (uid_t)strtol(arg, NULL, 10);
510
468
break;
511
469
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
470
gid = (gid_t)strtol(arg, NULL, 10);
520
471
break;
521
472
case 132: /* --debug */
522
473
debug = true;
523
474
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
475
case ARGP_KEY_ARG:
543
476
/* Cryptsetup always passes an argument, which is an empty
544
477
string if "none" was specified in /etc/crypttab. So if
545
478
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
481
}
482
break;
483
case ARGP_KEY_END:
484
break;
549
485
default:
550
486
return ARGP_ERR_UNKNOWN;
551
487
}
552
return errno; /* Set to 0 at start */
488
return 0;
553
489
}
554
490
555
491
/* This option parser is the same as parse_opt() above, except it
556
492
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
562
497
case 'g': /* --global-options */
563
498
case 'G': /* --global-env */
564
499
case 'o': /* --options-for */
570
505
case 129: /* --config-file */
571
506
free(argfile);
572
507
argfile = strdup(arg);
573
break;
508
if(argfile == NULL){
509
perror("strdup");
510
}
511
break;
574
512
case 130: /* --userid */
575
513
case 131: /* --groupid */
576
514
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
581
517
break;
582
518
default:
583
519
return ARGP_ERR_UNKNOWN;
584
520
}
585
return errno;
521
return 0;
586
522
}
587
523
588
524
struct argp argp = { .options = options,
590
526
.args_doc = "",
591
527
.doc = "Mandos plugin runner -- Run plugins" };
592
528
593
/* Parse using parse_opt_config_file() in order to get the custom
529
/* Parse using the parse_opt_config_file in order to get the custom
594
530
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
534
exitstatus = EXIT_FAILURE;
609
535
goto fallback;
610
536
}
611
537
613
539
argp.parser = parse_opt;
614
540
615
541
/* Open the configfile if available */
616
if(argfile == NULL){
542
if (argfile == NULL){
617
543
conffp = fopen(AFILE, "r");
618
544
} else {
619
545
conffp = fopen(argfile, "r");
620
}
546
}
621
547
if(conffp != NULL){
622
548
char *org_line = NULL;
623
549
char *p, *arg, *new_arg, *line;
624
550
size_t size = 0;
551
ssize_t sret;
625
552
const char whitespace_delims[] = " \r\t\f\v\n";
626
553
const char comment_delim[] = "#";
627
554
628
555
custom_argc = 1;
629
556
custom_argv = malloc(sizeof(char*) * 2);
630
557
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
633
560
goto fallback;
634
561
}
635
562
custom_argv[0] = argv[0];
636
563
custom_argv[1] = NULL;
637
564
638
565
/* for each line in the config file, strip whitespace and ignore
639
566
commented text */
640
567
while(true){
642
569
if(sret == -1){
643
570
break;
644
571
}
645
572
646
573
line = org_line;
647
574
arg = strsep(&line, comment_delim);
648
575
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
578
}
652
579
new_arg = strdup(p);
653
580
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
656
583
free(org_line);
657
584
goto fallback;
658
585
}
661
588
custom_argv = realloc(custom_argv, sizeof(char *)
662
589
* ((unsigned int) custom_argc + 1));
663
590
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
666
593
free(org_line);
667
594
goto fallback;
668
595
}
669
596
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
597
custom_argv[custom_argc] = NULL;
671
598
}
672
599
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
600
free(org_line);
682
601
} else {
683
602
/* Check for harmful errors and go to fallback. Other errors might
684
603
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
perror("fopen");
606
exitstatus = EXIT_FAILURE;
688
607
goto fallback;
689
608
}
690
609
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
693
612
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
708
618
goto fallback;
709
619
}
710
620
}
711
621
712
622
/* Parse actual command line arguments, to let them override the
713
623
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
728
628
goto fallback;
729
629
}
730
630
735
635
for(char **a = p->argv; *a != NULL; a++){
736
636
fprintf(stderr, "\tArg: %s\n", *a);
737
637
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
739
639
for(char **a = p->environ; *a != NULL; a++){
740
640
fprintf(stderr, "\t%s\n", *a);
741
641
}
742
642
}
743
643
}
744
644
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
645
/* Strip permissions down to nobody */
646
ret = setuid(uid);
647
if (ret == -1){
648
perror("setuid");
649
}
768
650
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
772
ret = setuid(uid);
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
651
if (ret == -1){
652
perror("setgid");
653
}
654
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
661
if(dir == NULL){
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
664
goto fallback;
665
}
666
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
778
668
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
669
int dir_fd = dirfd(dir);
670
if(dir_fd >= 0){
671
ret = set_cloexec_flag(dir_fd);
672
if(ret < 0){
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
675
goto fallback;
676
}
820
677
}
821
678
}
822
679
824
681
825
682
/* Read and execute any executable in the plugin directory*/
826
683
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
684
dirst = readdir(dir);
830
685
831
686
/* All directory entries have been processed */
832
687
if(dirst == NULL){
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
688
if (errno == EBADF){
689
perror("readdir");
690
exitstatus = EXIT_FAILURE;
836
691
goto fallback;
837
692
}
838
693
break;
848
703
849
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
850
705
".dpkg-old",
851
".dpkg-bak",
852
706
".dpkg-divert", NULL };
853
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
854
708
size_t pre_len = strlen(*pre);
868
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
723
size_t suf_len = strlen(*suf);
870
724
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
725
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
726
== 0)){
873
727
if(debug){
874
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
883
737
continue;
884
738
}
885
739
}
886
740
887
741
char *filename;
888
742
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
891
744
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
895
746
}
896
747
if(ret < 0){
897
error(0, errno, "asprintf");
748
perror("asprintf");
898
749
continue;
899
750
}
900
751
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
752
ret = stat(filename, &st);
753
if (ret == -1){
754
perror("stat");
904
755
free(filename);
905
756
continue;
906
757
}
907
758
908
759
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
911
761
if(debug){
912
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
763
" with bad type or mode\n", filename);
918
768
919
769
plugin *p = getplugin(dirst->d_name);
920
770
if(p == NULL){
921
error(0, errno, "getplugin");
771
perror("getplugin");
922
772
free(filename);
923
773
continue;
924
774
}
936
786
if(g != NULL){
937
787
for(char **a = g->argv + 1; *a != NULL; a++){
938
788
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
789
perror("add_argument");
940
790
}
941
791
}
942
792
/* Add global environment variables */
943
793
for(char **e = g->environ; *e != NULL; e++){
944
794
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
795
perror("add_environment");
946
796
}
947
797
}
948
798
}
953
803
if(p->environ[0] != NULL){
954
804
for(char **e = environ; *e != NULL; e++){
955
805
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
806
perror("add_environment");
957
807
}
958
808
}
959
809
}
960
810
961
811
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
812
ret = pipe(pipefd);
813
if (ret == -1){
814
perror("pipe");
815
exitstatus = EXIT_FAILURE;
966
816
goto fallback;
967
817
}
968
818
/* Ask OS to automatic close the pipe on exec */
969
819
ret = set_cloexec_flag(pipefd[0]);
970
820
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
973
823
goto fallback;
974
824
}
975
825
ret = set_cloexec_flag(pipefd[1]);
976
826
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
827
perror("set_cloexec_flag");
828
exitstatus = EXIT_FAILURE;
979
829
goto fallback;
980
830
}
981
831
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
833
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
834
perror("sigprocmask");
835
exitstatus = EXIT_FAILURE;
988
836
goto fallback;
989
837
}
990
838
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
839
pid_t pid = fork();
995
840
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
841
perror("fork");
842
exitstatus = EXIT_FAILURE;
998
843
goto fallback;
999
844
}
1000
845
if(pid == 0){
1001
846
/* this is the child process */
1002
847
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
848
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
849
perror("sigaction");
850
_exit(EXIT_FAILURE);
1006
851
}
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
853
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
854
perror("sigprocmask");
855
_exit(EXIT_FAILURE);
1011
856
}
1012
857
1013
858
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
859
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
860
perror("dup2");
861
_exit(EXIT_FAILURE);
1017
862
}
1018
863
1019
864
if(dirfd(dir) < 0){
1023
868
}
1024
869
if(p->environ[0] == NULL){
1025
870
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
871
perror("execv");
872
_exit(EXIT_FAILURE);
1028
873
}
1029
874
} else {
1030
875
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
876
perror("execve");
877
_exit(EXIT_FAILURE);
1033
878
}
1034
879
}
1035
880
/* no return */
1036
881
}
1037
882
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
883
close(pipefd[1]); /* Close unused write end of pipe */
1040
884
free(filename);
1041
885
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
886
if (new_plugin == NULL){
887
perror("getplugin");
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
889
if(ret < 0){
1048
error(0, errno, "sigprocmask");
890
perror("sigprocmask");
1049
891
}
1050
exitstatus = EX_OSERR;
892
exitstatus = EXIT_FAILURE;
1051
893
goto fallback;
1052
894
}
1053
895
1056
898
1057
899
/* Unblock SIGCHLD so signal handler can be run if this process
1058
900
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
902
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
903
perror("sigprocmask");
904
exitstatus = EXIT_FAILURE;
1065
905
goto fallback;
1066
906
}
1067
907
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
908
FD_SET(new_plugin->fd, &rfds_all);
1070
909
1071
if(maxfd < new_plugin->fd){
910
if (maxfd < new_plugin->fd){
1072
911
maxfd = new_plugin->fd;
1073
912
}
913
1074
914
}
1075
915
1076
TEMP_FAILURE_RETRY(closedir(dir));
916
closedir(dir);
1077
917
dir = NULL;
1078
free_plugin(getplugin(NULL));
1079
918
1080
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
920
if(p->pid != 0){
1082
921
break;
1087
926
free_plugin_list();
1088
927
}
1089
928
}
1090
929
1091
930
/* Main loop while running plugins exist */
1092
931
while(plugin_list){
1093
932
fd_set rfds = rfds_all;
1094
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
934
if (select_ret == -1){
935
perror("select");
936
exitstatus = EXIT_FAILURE;
1098
937
goto fallback;
1099
938
}
1100
939
/* OK, now either a process completed, or something can be read
1101
940
from one of them */
1102
941
for(plugin *proc = plugin_list; proc != NULL;){
1103
942
/* Is this process completely done? */
1104
if(proc->completed and proc->eof){
943
if(proc->eof and proc->completed){
1105
944
/* Only accept the plugin output if it exited cleanly */
1106
945
if(not WIFEXITED(proc->status)
1107
946
or WEXITSTATUS(proc->status) != 0){
1108
947
/* Bad exit by plugin */
1109
948
1110
949
if(debug){
1111
950
if(WIFEXITED(proc->status)){
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1115
953
WEXITSTATUS(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
1122
958
} else if(WCOREDUMP(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1125
961
}
1126
962
}
1127
963
1128
964
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
965
FD_CLR(proc->fd, &rfds_all);
966
1132
967
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
1137
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
1140
goto fallback;
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
978
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
1141
986
}
1142
987
1143
988
plugin *next_plugin = proc->next;
1144
989
free_plugin(proc);
1145
990
proc = next_plugin;
1146
1147
/* We are done modifying process list, so unblock signal */
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
1151
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1154
goto fallback;
1155
}
1156
1157
if(plugin_list == NULL){
1158
break;
1159
}
1160
1161
991
continue;
1162
992
}
1163
993
1164
994
/* This process exited nicely, so print its buffer */
1165
995
1166
996
bool bret = print_out_password(proc->buffer,
1167
997
proc->buffer_length);
1168
998
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1171
1001
}
1172
1002
goto fallback;
1173
1003
}
1174
1004
1175
1005
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1007
/* This process had nothing to say at this time */
1180
1008
proc = proc->next;
1181
1009
continue;
1184
1012
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
1014
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1015
if (proc->buffer == NULL){
1016
perror("malloc");
1017
exitstatus = EXIT_FAILURE;
1190
1018
goto fallback;
1191
1019
}
1192
1020
proc->buffer_size += BUFFER_SIZE;
1193
1021
}
1194
1022
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1199
if(sret < 0){
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1200
1026
/* Read error from this process; ignore the error */
1201
1027
proc = proc->next;
1202
1028
continue;
1203
1029
}
1204
if(sret == 0){
1030
if(ret == 0){
1205
1031
/* got EOF */
1206
1032
proc->eof = true;
1207
1033
} else {
1208
proc->buffer_length += (size_t) sret;
1034
proc->buffer_length += (size_t) ret;
1209
1035
}
1210
1036
}
1211
1037
}
1212
1213
1038
1039
1214
1040
fallback:
1215
1041
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1218
1043
/* Fallback if all plugins failed, none are found or an error
1219
1044
occured */
1220
1045
bool bret;
1228
1053
}
1229
1054
bret = print_out_password(passwordbuffer, len);
1230
1055
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1056
perror("print_out_password");
1057
exitstatus = EXIT_FAILURE;
1233
1058
}
1234
1059
}
1235
1060
1236
1061
/* Restore old signal handler */
1237
1062
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
1063
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1241
1066
}
1242
1067
1243
1068
if(custom_argv != NULL){
1244
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1245
1070
free(*arg);
1251
1076
closedir(dir);
1252
1077
}
1253
1078
1254
/* Kill the processes */
1079
/* Free the process list and kill the processes */
1255
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1256
1081
if(p->pid != 0){
1257
1082
close(p->fd);
1258
1083
ret = kill(p->pid, SIGTERM);
1259
1084
if(ret == -1 and errno != ESRCH){
1260
1085
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1086
perror("kill");
1262
1087
}
1263
1088
}
1264
1089
}
1265
1090
1266
1091
/* Wait for any remaining child processes to terminate */
1267
do {
1092
do{
1268
1093
ret = wait(NULL);
1269
1094
} while(ret >= 0);
1270
1095
if(errno != ECHILD){
1271
error(0, errno, "wait");
1096
perror("wait");
1272
1097
}
1273
1098
1274
1099
free_plugin_list();
1275
1100
1276
1101
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0