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- Committer: Teddy Hogeborn
- Date: 2011-07-27 18:27:02 UTC
- mfrom: (237.4.16 release)
- Revision ID: teddy@fukt.bsnet.se-20110727182702-lmoxs1l571yikkl0
Merge from release branch.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- 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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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> /* 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 */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
81
const char *argp_program_version = "plugin-runner " VERSION;
73
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
83
75
struct plugin;
76
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
79
86
char **argv;
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
101
108
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))){
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))){
106
113
return p;
107
114
}
108
115
}
109
116
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
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){
112
122
return NULL;
113
123
}
114
124
char *copy_name = NULL;
115
125
if(name != NULL){
116
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
118
133
return NULL;
119
134
}
120
135
}
121
136
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
126
141
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
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;
129
147
free(copy_name);
130
148
free(new_plugin);
149
errno = e;
131
150
return NULL;
132
151
}
133
152
new_plugin->argv[0] = copy_name;
134
153
new_plugin->argv[1] = NULL;
135
154
136
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
158
if(new_plugin->environ == NULL){
159
int e = errno;
138
160
free(copy_name);
139
161
free(new_plugin->argv);
140
162
free(new_plugin);
163
errno = e;
141
164
return NULL;
142
165
}
143
166
new_plugin->environ[0] = NULL;
151
174
static bool add_to_char_array(const char *new, char ***array,
152
175
int *len){
153
176
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
156
181
/* Malloc check */
157
182
if(*array == NULL){
158
183
return false;
159
184
}
160
185
/* Make a copy of the new string */
161
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
162
190
if(copy == NULL){
163
191
return false;
164
192
}
190
218
if(strncmp(*e, def, namelen + 1) == 0){
191
219
/* It already exists */
192
220
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
194
225
if(new == NULL){
195
226
return false;
196
227
}
206
237
/*
207
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
239
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
241
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
244
/* If reading the flags failed, return error indication now. */
215
245
if(ret < 0){
216
246
return ret;
217
247
}
218
248
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
220
251
}
221
252
222
253
223
254
/* Mark processes as completed when they exit, and save their exit
224
255
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
226
258
while(true){
227
259
plugin *proc = plugin_list;
228
260
int status;
232
264
break;
233
265
}
234
266
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
237
270
}
238
/* No child processes */
239
break;
271
error(0, errno, "waitpid");
240
272
}
241
273
242
274
/* A child exited, find it in process_list */
248
280
continue;
249
281
}
250
282
proc->status = status;
251
proc->completed = true;
283
proc->completed = 1;
252
284
}
285
errno = old_errno;
253
286
}
254
287
255
288
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
289
static bool print_out_password(const char *buffer, size_t length){
257
290
ssize_t ret;
258
291
for(size_t written = 0; written < length; written += (size_t)ret){
259
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
277
310
}
278
311
free(plugin_node->environ);
279
312
free(plugin_node->buffer);
280
313
281
314
/* Removes the plugin from the singly-linked list */
282
315
if(plugin_node == plugin_list){
283
316
/* First one - simple */
311
344
struct stat st;
312
345
fd_set rfds_all;
313
346
int ret, maxfd = 0;
347
ssize_t sret;
314
348
uid_t uid = 65534;
315
349
gid_t gid = 65534;
316
350
bool debug = false;
325
359
sigemptyset(&sigchld_action.sa_mask);
326
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
361
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
330
364
goto fallback;
331
365
}
332
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
367
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
336
370
goto fallback;
337
371
}
338
372
370
404
.doc = "Group ID the plugins will run as", .group = 3 },
371
405
{ .name = "debug", .key = 132,
372
406
.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 },
373
416
{ .name = NULL }
374
417
};
375
418
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
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;
379
424
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;
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
389
430
}
390
431
}
391
432
}
392
433
break;
393
434
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
435
add_environment(getplugin(NULL), arg, true);
400
436
break;
401
437
case 'o': /* --options-for */
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;
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;
419
456
}
420
457
}
421
458
}
422
459
break;
423
460
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
461
{
428
462
char *envdef = strchr(arg, ':');
429
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
430
466
break;
431
467
}
432
468
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
435
474
}
475
add_environment(getplugin(arg), envdef, true);
436
476
}
437
477
break;
438
478
case 'd': /* --disable */
439
if (arg != NULL){
479
{
440
480
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
443
483
}
444
p->disabled = true;
445
484
}
446
485
break;
447
486
case 'e': /* --enable */
448
if (arg != NULL){
487
{
449
488
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
452
491
}
453
p->disabled = false;
454
492
}
455
493
break;
456
494
case 128: /* --plugin-dir */
457
495
free(plugindir);
458
496
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
497
break;
463
498
case 129: /* --config-file */
464
499
/* This is already done by parse_opt_config_file() */
465
500
break;
466
501
case 130: /* --userid */
467
uid = (uid_t)strtol(arg, NULL, 10);
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;
468
510
break;
469
511
case 131: /* --groupid */
470
gid = (gid_t)strtol(arg, NULL, 10);
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;
471
520
break;
472
521
case 132: /* --debug */
473
522
debug = true;
474
523
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
*/
475
542
case ARGP_KEY_ARG:
476
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
477
break;
478
case ARGP_KEY_END:
479
break;
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
480
549
default:
481
550
return ARGP_ERR_UNKNOWN;
482
551
}
483
return 0;
552
return errno; /* Set to 0 at start */
484
553
}
485
554
486
555
/* This option parser is the same as parse_opt() above, except it
487
556
ignores everything but the --config-file option. */
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
491
switch (key) {
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
492
562
case 'g': /* --global-options */
493
563
case 'G': /* --global-env */
494
564
case 'o': /* --options-for */
500
570
case 129: /* --config-file */
501
571
free(argfile);
502
572
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
505
}
506
break;
573
break;
507
574
case 130: /* --userid */
508
575
case 131: /* --groupid */
509
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
510
580
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
512
581
break;
513
582
default:
514
583
return ARGP_ERR_UNKNOWN;
515
584
}
516
return 0;
585
return errno;
517
586
}
518
587
519
588
struct argp argp = { .options = options,
521
590
.args_doc = "",
522
591
.doc = "Mandos plugin runner -- Run plugins" };
523
592
524
/* Parse using the parse_opt_config_file in order to get the custom
593
/* Parse using parse_opt_config_file() in order to get the custom
525
594
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
530
609
goto fallback;
531
610
}
532
611
534
613
argp.parser = parse_opt;
535
614
536
615
/* Open the configfile if available */
537
if (argfile == NULL){
616
if(argfile == NULL){
538
617
conffp = fopen(AFILE, "r");
539
618
} else {
540
619
conffp = fopen(argfile, "r");
541
}
620
}
542
621
if(conffp != NULL){
543
622
char *org_line = NULL;
544
623
char *p, *arg, *new_arg, *line;
545
624
size_t size = 0;
546
ssize_t sret;
547
625
const char whitespace_delims[] = " \r\t\f\v\n";
548
626
const char comment_delim[] = "#";
549
627
550
628
custom_argc = 1;
551
629
custom_argv = malloc(sizeof(char*) * 2);
552
630
if(custom_argv == NULL){
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
555
633
goto fallback;
556
634
}
557
635
custom_argv[0] = argv[0];
558
636
custom_argv[1] = NULL;
559
637
560
638
/* for each line in the config file, strip whitespace and ignore
561
639
commented text */
562
640
while(true){
564
642
if(sret == -1){
565
643
break;
566
644
}
567
645
568
646
line = org_line;
569
647
arg = strsep(&line, comment_delim);
570
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
573
651
}
574
652
new_arg = strdup(p);
575
653
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
578
656
free(org_line);
579
657
goto fallback;
580
658
}
583
661
custom_argv = realloc(custom_argv, sizeof(char *)
584
662
* ((unsigned int) custom_argc + 1));
585
663
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
588
666
free(org_line);
589
667
goto fallback;
590
668
}
591
669
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
593
671
}
594
672
}
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
}
595
681
free(org_line);
596
682
} else {
597
683
/* Check for harmful errors and go to fallback. Other errors might
598
684
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
602
688
goto fallback;
603
689
}
604
690
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
607
693
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
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
708
goto fallback;
614
709
}
615
710
}
616
711
617
712
/* Parse actual command line arguments, to let them override the
618
713
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
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;
623
728
goto fallback;
624
729
}
625
730
630
735
for(char **a = p->argv; *a != NULL; a++){
631
736
fprintf(stderr, "\tArg: %s\n", *a);
632
737
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
634
739
for(char **a = p->environ; *a != NULL; a++){
635
740
fprintf(stderr, "\t%s\n", *a);
636
741
}
637
742
}
638
743
}
639
744
640
/* Strip permissions down to nobody */
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 */
768
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
641
772
ret = setuid(uid);
642
if (ret == -1){
643
perror("setuid");
644
}
645
setgid(gid);
646
if (ret == -1){
647
perror("setgid");
648
}
649
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
656
if(dir == NULL){
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
659
goto fallback;
660
}
661
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
663
778
{
664
int dir_fd = dirfd(dir);
665
if(dir_fd >= 0){
666
ret = set_cloexec_flag(dir_fd);
667
if(ret < 0){
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
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;
672
820
}
673
821
}
674
822
676
824
677
825
/* Read and execute any executable in the plugin directory*/
678
826
while(true){
679
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
680
830
681
831
/* All directory entries have been processed */
682
832
if(dirst == NULL){
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
686
836
goto fallback;
687
837
}
688
838
break;
698
848
699
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
700
850
".dpkg-old",
851
".dpkg-bak",
701
852
".dpkg-divert", NULL };
702
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
703
854
size_t pre_len = strlen(*pre);
717
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
869
size_t suf_len = strlen(*suf);
719
870
if((d_name_len >= suf_len)
720
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
721
872
== 0)){
722
873
if(debug){
723
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
883
continue;
733
884
}
734
885
}
735
886
736
887
char *filename;
737
888
if(plugindir == NULL){
738
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
739
891
} else {
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
741
895
}
742
896
if(ret < 0){
743
perror("asprintf");
897
error(0, errno, "asprintf");
744
898
continue;
745
899
}
746
900
747
ret = stat(filename, &st);
748
if (ret == -1){
749
perror("stat");
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
750
904
free(filename);
751
905
continue;
752
906
}
753
907
754
908
/* Ignore non-executable files */
755
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
756
911
if(debug){
757
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
758
913
" with bad type or mode\n", filename);
763
918
764
919
plugin *p = getplugin(dirst->d_name);
765
920
if(p == NULL){
766
perror("getplugin");
921
error(0, errno, "getplugin");
767
922
free(filename);
768
923
continue;
769
924
}
781
936
if(g != NULL){
782
937
for(char **a = g->argv + 1; *a != NULL; a++){
783
938
if(not add_argument(p, *a)){
784
perror("add_argument");
939
error(0, errno, "add_argument");
785
940
}
786
941
}
787
942
/* Add global environment variables */
788
943
for(char **e = g->environ; *e != NULL; e++){
789
944
if(not add_environment(p, *e, false)){
790
perror("add_environment");
945
error(0, errno, "add_environment");
791
946
}
792
947
}
793
948
}
798
953
if(p->environ[0] != NULL){
799
954
for(char **e = environ; *e != NULL; e++){
800
955
if(not add_environment(p, *e, false)){
801
perror("add_environment");
956
error(0, errno, "add_environment");
802
957
}
803
958
}
804
959
}
805
960
806
961
int pipefd[2];
807
ret = pipe(pipefd);
808
if (ret == -1){
809
perror("pipe");
810
exitstatus = EXIT_FAILURE;
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
811
966
goto fallback;
812
967
}
813
968
/* Ask OS to automatic close the pipe on exec */
814
969
ret = set_cloexec_flag(pipefd[0]);
815
970
if(ret < 0){
816
perror("set_cloexec_flag");
817
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
818
973
goto fallback;
819
974
}
820
975
ret = set_cloexec_flag(pipefd[1]);
821
976
if(ret < 0){
822
perror("set_cloexec_flag");
823
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
824
979
goto fallback;
825
980
}
826
981
/* Block SIGCHLD until process is safely in process list */
827
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
828
985
if(ret < 0){
829
perror("sigprocmask");
830
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
831
988
goto fallback;
832
989
}
833
990
/* Starting a new process to be watched */
834
pid_t pid = fork();
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
835
995
if(pid == -1){
836
perror("fork");
837
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
838
998
goto fallback;
839
999
}
840
1000
if(pid == 0){
841
1001
/* this is the child process */
842
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
843
1003
if(ret < 0){
844
perror("sigaction");
845
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
846
1006
}
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
848
1008
if(ret < 0){
849
perror("sigprocmask");
850
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
851
1011
}
852
1012
853
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
854
1014
if(ret == -1){
855
perror("dup2");
856
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
857
1017
}
858
1018
859
1019
if(dirfd(dir) < 0){
863
1023
}
864
1024
if(p->environ[0] == NULL){
865
1025
if(execv(filename, p->argv) < 0){
866
perror("execv");
867
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
868
1028
}
869
1029
} else {
870
1030
if(execve(filename, p->argv, p->environ) < 0){
871
perror("execve");
872
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
873
1033
}
874
1034
}
875
1035
/* no return */
876
1036
}
877
1037
/* Parent process */
878
close(pipefd[1]); /* Close unused write end of pipe */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
879
1040
free(filename);
880
1041
plugin *new_plugin = getplugin(dirst->d_name);
881
if (new_plugin == NULL){
882
perror("getplugin");
883
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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)));
884
1047
if(ret < 0){
885
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
886
1049
}
887
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
888
1051
goto fallback;
889
1052
}
890
1053
893
1056
894
1057
/* Unblock SIGCHLD so signal handler can be run if this process
895
1058
has already completed */
896
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
897
1062
if(ret < 0){
898
perror("sigprocmask");
899
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
900
1065
goto fallback;
901
1066
}
902
1067
903
FD_SET(new_plugin->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
904
1070
905
if (maxfd < new_plugin->fd){
1071
if(maxfd < new_plugin->fd){
906
1072
maxfd = new_plugin->fd;
907
1073
}
908
909
1074
}
910
1075
911
closedir(dir);
1076
TEMP_FAILURE_RETRY(closedir(dir));
912
1077
dir = NULL;
913
1078
free_plugin(getplugin(NULL));
1079
914
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
915
1081
if(p->pid != 0){
916
1082
break;
921
1087
free_plugin_list();
922
1088
}
923
1089
}
924
1090
925
1091
/* Main loop while running plugins exist */
926
1092
while(plugin_list){
927
1093
fd_set rfds = rfds_all;
928
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
929
if (select_ret == -1){
930
perror("select");
931
exitstatus = EXIT_FAILURE;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
932
1098
goto fallback;
933
1099
}
934
1100
/* OK, now either a process completed, or something can be read
935
1101
from one of them */
936
1102
for(plugin *proc = plugin_list; proc != NULL;){
937
1103
/* Is this process completely done? */
938
if(proc->eof and proc->completed){
1104
if(proc->completed and proc->eof){
939
1105
/* Only accept the plugin output if it exited cleanly */
940
1106
if(not WIFEXITED(proc->status)
941
1107
or WEXITSTATUS(proc->status) != 0){
942
1108
/* Bad exit by plugin */
943
1109
944
1110
if(debug){
945
1111
if(WIFEXITED(proc->status)){
946
fprintf(stderr, "Plugin %u exited with status %d\n",
947
(unsigned int) (proc->pid),
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
948
1115
WEXITSTATUS(proc->status));
949
} else if(WIFSIGNALED(proc->status)) {
950
fprintf(stderr, "Plugin %u killed by signal %d\n",
951
(unsigned int) (proc->pid),
952
WTERMSIG(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)));
953
1122
} else if(WCOREDUMP(proc->status)){
954
fprintf(stderr, "Plugin %d dumped core\n",
955
(unsigned int) (proc->pid));
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
956
1125
}
957
1126
}
958
1127
959
1128
/* Remove the plugin */
960
FD_CLR(proc->fd, &rfds_all);
961
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
962
1132
/* Block signal while modifying process_list */
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
if(ret < 0){
965
perror("sigprocmask");
966
exitstatus = EXIT_FAILURE;
967
goto fallback;
968
}
969
970
/* We are done modifying process list, so unblock signal */
971
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
972
NULL);
973
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
979
if(plugin_list == NULL){
980
break;
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;
981
1141
}
982
1142
983
1143
plugin *next_plugin = proc->next;
984
1144
free_plugin(proc);
985
1145
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
986
1161
continue;
987
1162
}
988
1163
989
1164
/* This process exited nicely, so print its buffer */
990
1165
991
1166
bool bret = print_out_password(proc->buffer,
992
1167
proc->buffer_length);
993
1168
if(not bret){
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
996
1171
}
997
1172
goto fallback;
998
1173
}
999
1174
1000
1175
/* This process has not completed. Does it have any output? */
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1002
1179
/* This process had nothing to say at this time */
1003
1180
proc = proc->next;
1004
1181
continue;
1007
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1008
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1009
1186
+ (size_t) BUFFER_SIZE);
1010
if (proc->buffer == NULL){
1011
perror("malloc");
1012
exitstatus = EXIT_FAILURE;
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1013
1190
goto fallback;
1014
1191
}
1015
1192
proc->buffer_size += BUFFER_SIZE;
1016
1193
}
1017
1194
/* Read from the process */
1018
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1019
BUFFER_SIZE);
1020
if(ret < 0){
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1199
if(sret < 0){
1021
1200
/* Read error from this process; ignore the error */
1022
1201
proc = proc->next;
1023
1202
continue;
1024
1203
}
1025
if(ret == 0){
1204
if(sret == 0){
1026
1205
/* got EOF */
1027
1206
proc->eof = true;
1028
1207
} else {
1029
proc->buffer_length += (size_t) ret;
1208
proc->buffer_length += (size_t) sret;
1030
1209
}
1031
1210
}
1032
1211
}
1033
1034
1212
1213
1035
1214
fallback:
1036
1215
1037
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1038
1218
/* Fallback if all plugins failed, none are found or an error
1039
1219
occured */
1040
1220
bool bret;
1048
1228
}
1049
1229
bret = print_out_password(passwordbuffer, len);
1050
1230
if(not bret){
1051
perror("print_out_password");
1052
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1053
1233
}
1054
1234
}
1055
1235
1056
1236
/* Restore old signal handler */
1057
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
1238
if(ret == -1){
1059
perror("sigaction");
1060
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1061
1241
}
1062
1242
1063
1243
if(custom_argv != NULL){
1064
1244
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1065
1245
free(*arg);
1071
1251
closedir(dir);
1072
1252
}
1073
1253
1074
/* Free the process list and kill the processes */
1254
/* Kill the processes */
1075
1255
for(plugin *p = plugin_list; p != NULL; p = p->next){
1076
1256
if(p->pid != 0){
1077
1257
close(p->fd);
1078
1258
ret = kill(p->pid, SIGTERM);
1079
1259
if(ret == -1 and errno != ESRCH){
1080
1260
/* Set-uid proccesses might not get closed */
1081
perror("kill");
1261
error(0, errno, "kill");
1082
1262
}
1083
1263
}
1084
1264
}
1085
1265
1086
1266
/* Wait for any remaining child processes to terminate */
1087
do{
1267
do {
1088
1268
ret = wait(NULL);
1089
1269
} while(ret >= 0);
1090
1270
if(errno != ECHILD){
1091
perror("wait");
1271
error(0, errno, "wait");
1092
1272
}
1093
1273
1094
1274
free_plugin_list();
1095
1275
1096
1276
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0